Difficulty in closing an account

I paid my account on the 29 June 2018, went to the store to rsquest the account to be closed. I was told it would be closed on the 13th of July. I never received confirmation that it was closed so I called again. I was told I had made another payment in July(which I never made as I was not owing anything) and that my account was not closed. My request to close the account was removed and my account was active.

Why are transactions that I am not aware of appearing on my account, why does it take long to close the account and who made the payment in July.