Closing an Account

I have been trying to close an account since May 2019. I went to the shop to close the account paid in full .The sales lady said the account is now closed. Then comes a statement in June 2019. I phone Edgars customer service so that they can help me but instead they transfer to accounts which i stayed on the line for 30 minutes without anyone responding to me. Sent numerous emails but no difference. I am shocked and disappointing by Edgars. This month also i got the statement and i phoned but same thing. What is a person suppose to do to close an account.