How do I remove the automatic payment in Capital One?

The choice is yours. Setting up automatic payments has its pros and cons. To determine if this payment method is suitable for you, you should analyse each of them critically:
Creating a payment schedule is fast and easy, and you can do it from your mobile phone or computer without visiting a bank branch.
We designed the automatic deduction tool so consumers can save time. 
No need to write checks or transfer funds.
If you make payments with checks often, it could be a smart way to save money. Some banks do not offer free checks. You will also avoid fines, penalties, and service interruptions if you pay your bills on time.
This is a way to protect -and even raise- your credit score since late payments will no longer be an issue (and you already know how significant payment history is to your credit score).
Automatic debit also facilitates the management of the family budget since you can always check the total of the frequent expenses from your account.

Automatic payments may put your account into overdraft (especially if you don’t check your balance often).
The cost of a returned automatic withdrawal due to insufficient funds is the same as the cost of a failed transfer. This means that fees and commissions could be steep.
Moreover, not all companies accept automated debit as a mode of payment. 

For this reason, you may have to pay some companies directly.
If your credit card associated with automatic payments expires, you will have to change all the bank information in each of the providers. This could take a lot of time.

A membership you don’t use or have no interest in could be costing you money. You won’t realize that you are losing money on unnecessary spending if you aren’t paying them personally or consciously.

Why would anyone shy away from scheduled debit when it offers so many benefits? Simple: each user’s financial situation is unique, and not everyone works the same way. For some, automatic payments can be a dream, but for others, they can be a nightmare. Because of this, we recommend avoiding this payment method if:

You do not receive money regularly. Independent contractors, freelancers, and self-employed individuals collect their fees for work done and delivered. Keeping automatic payments at bay may be appropriate if this is the case for you. Consider the possibility that you do not have enough money on your bank account at the time of processing the payment. A low balance account or credit card could be returned, overdrawn, and – to top it off – go into default if an automatic payment is made.

You are unemployed right now. You will often receive the same amount of money month after month if you have a permanent job as a dependent. Losing your job, however, also means losing the ability to receive a regular monthly income. You should always switch off automatic payments in this situation so you can better manage your finances and unemployment benefits (if applicable).

It’s nice to be in control. If you are a control freak, putting your account or credit card on autopilot might backfire. Regardless of the programming, you’ll still need to check the computer to make sure the payment was deducted (and that is exactly what this method is intended to avoid). In other words, if you like to take the reins, it would not make much sense to use them.

Payment errors could occur. A provider can charge the same amount twice, though it does not happen often. If you don’t keep track of your accounts, you could lose money due to that double payment going unnoticed.