Stopping paying for your energy by monthly DD in order to save money is a really bad idea. The tariff will be more, you will spend much more on an annual basis, and the winter months' charges will be the thick end of £1k each if the price cap predictions are correct.
For anyone with a big credit balance, figure out what your annual bill would be at the current standard variable tariff, double it to take account of the increases, then deduct the value of your credit. Divide that number by 12, and that is the amount you should pay. Contact your supplier and explain this, they will accept it.
In February you will be in debit, depending on the size of the next increase, you'll be able to increase the DD if you wish.