Account not updated

I took out a contract with BLC in September 2017. Then in 2018 i changed my bank but continued making making manual payments to them using my ref number. I was surprised when i got a call from a debt collection company called alliance that they will be taking over as i was not making my payments. After many emails and calls to BLC nobody was able to assist me. Fine, i now made my payments via alliance till i paid it off. Problem now is BLC is contacting me telling me i need to make payment. I checked my credit status and it shows i am several months behind on my BLC account meaning they did not update my account.

Anyone from Blue label connect please assist me regarding this matter.