Bad client service

I bought a tv in December 2020, I was told that the first instalment would go off on my pay date in January 2021. Till today they haven’t debited my account, I phoned-through to them regarding this matter and I was told that they are having system issues, I should continue waiting for the debit to go off. The debit still hasn’t gone off till this day. Now I am being furnished with a statement reflecting my arrears, obviously with interest. I am so unhappy with this treatment, their mistake is now affecting my name, and this is unacceptable.Please rectify this connect financial solutions.