Horrible service

I have an Edgards Account which I always paid in store. During the lock down I search for the details and paid online for the 1st time. The 1st payment was received by Edgars in March. In April I paid the same way and the payment was not allocated to my account. I tried contacting Edgars with no joy. I notice that the reference used on the 2nd payment had one digit incorrect. I send an email with proof of payment for both March/April and ask if they can please allocated the payment to my account. That was the finale settlement amount paid in April. The matter was never resolved and I received a statement with interest billed on the account. When I called I was advise they are short staffed and working from home. That is after 2 months with no communication from them. I only receive statement and interest is accumulating on my account. I have send an email to *** no feedback. On the 24/07/2020 I also send an email to *** with no feedback. I only receive monthly statement. I would like to get the matter resolve and i would like to close my account as i'm really not happy with the service.