Thank you for your advice. Yes I am fairly certain the charge is correct but I am going to double check it. I will avoid the DCA and deal with Flow directly. Thank you also for the customer services guide link. I am going to have to do a credit file check next as concerned about that and another point to bring up if it has gone on there.

Hello...Had gas/electric supplied by Flow Energy until 6th May 2017 before switching to another company. Final bill issued by Flow Energy 13th June 2017 - advised they would take final d/d 14 days later. Have now received a letter on 2/5/18 from Allied Credit International Ltd from Glasgow stating that the amount is due. (Also, letter dated 23/4/18 but not received until 2/5/18). Have checked bank thoroughly and Flow Energy never took the final direct debit as they said they would at end of June 2017. Also never received any communication at any point from Flow Energy since that email in June 2017 when they advised they would take the final d/d at end of June 2017 i.e. no chase /reminder etc etc. Now concerned I have a DCA after me, and that credit score may be marked also They are just under the 12month rule on backbilling that I have read about on Ofcom website but unsure if Flow energy even agreed to that voluntary charter. Who do I speak to - Allied? But assuming they have just 'bought' the debt. Or do I contact Flow Energy and complain? I had no issue about payng it at the time but thought it had been paid and am annoyed to now have this thrown at me randomly nearly a year later - and especially having a DCA involved!! Any leg to stand on?!