Worst Service Ever!

Worst experience of my life - I paid my account in full in September 2020 and since then, Edgars has been billing me for my club cards etc. and never closed my account!! I have contacted head office and several other "help lines" many times and the collection department still phones me weekly asking for money - I HAVE CLOSED MY ACCOUNT...so what does one do now? I have sent a proof of my payment through and emailed collections and reception at Retailability and nothing happens.

Worst operation I have ever come across - can't believe a business like this exists!