mobil loans

They are illegal. Close your bank account or revoke the ACH authorization. Don't pay a penny. How much did you borrow? How much did you pay?

Buddy, stop paying them immediately. As SC suggested above, revoke the ACH authorization. Your checking account is in a bad shape, so try some other, part-time job opportunities to increase your income.

You can opt for legal help if required.

You have already paid the principal amount, so no need to pay more as they are illegal. If they take out money from your account, then contact your state's attorney general.

I borrowed $800 and have paid $796.

So I go to my bank and ask them to revoke the ACH.
Then send mobil loans a letter?

So, your principal amount is $800..right? And you have paid till now $796. You must pay them the balance $4. There's no need to pay the interest.

If they still pull out the money, then make a complaint to the attorney general in your state

Yes revoke the ACH authorization. The company can’t sue you if you don’t pay the interest amount. They are illegal loans just like tribal loans.

Can someone please tell me how to revoke ACH?

Notify the payday lender in writing to stop the withdrawals and inform that you are revoking the automatically withdraw funds from your account.
Send a copy of the letter you sent to the payday lender. Tell your financial institution in writing that further transfers are unauthorized and should be stopped or refunded to you.

You have to act quickly as ACH processing generally debits the checking account on the next business day following the transaction. Make a call to your bank and learn the process to revoke ACH because the process can be different at each financial institution.