Credited by gas company

Hayleyl12

Hi all. I have a pre payment meter for gas and electric, I have left my supplier and have been sent a bill for over £400 as it turns out my supplier credited my gas meter back in January in error. Bit of back ground... I had a debt relief order back in dec 19 and this cleared my gas and electric, I notified the company who took a while to sort this out and clear the debt on the meter, they then in error credited the meter, we assumed that it was the over payment from the debt relief order being submitted and the time it took for them to sort it out, apparently this is not the case. Is there anything I should or could do to dispute this error from them?   I have had the following response from them regarding my query so far - You contacted npower on 13.12.19 after being granted a Debt Relief Order on 06.12.2019 and requested debts be removed from the prepayment meters in your property. As we had not been made aware of the DRO you were required to contact us on 16.12.19 and again request the debts be removed from the prepayment meters in your property.

You were provided with a reference number (47652663) and advised to go to the Cost Cutter store on Sturmer Road. This code reset your electricity meter and removed any debt being collected.

On the same day a message was sent to your gas meter to remove £455 debt as we are unable to reset gas meters in the same manner as electricity meters. The message would have been collected via your gas prepayment vends.

You contacted our complaints department on 17.12.19 where a complaint was raised regarding the debts still collecting on your prepayment meters. You were advised to insert the electricity key into the electricity meter but you were not at home whilst the call was made.

On the 18.12.19 an further message was sent to your gas meter to remove £187.17 which was being recovered via a weekly Debt Recovery Rate. Again this would have been collected via your prepayment gas vends as we are unable to reset gas prepayment meters in the same manner as prepayment electricity meters.

After the messages were sent to your gas meter, we received 4 prepayment vends on your gas account totalling £20 between 20.12.19 & 27.10.20.

The outstanding balance on your prepayment gas account is due to the messages sent to your prepayment meter which resulted in incorrect credit being applied to your meter which you have used before the supply left npower. As you did not make us aware of this mistake and continued to use the gas supply without vending, the outstanding balance is genuine.

any advise would be appreciated