Account closure unprofessional

I went to the office branch to pay off my account and close it. I was told that I can only be able to pay off but I must call the call center to have the account closed. I then spoke with a gentleman called Kyle who promised me that my account will be closed on the 13 of April. Guess what, that did not happen to day I received a statement showing that I still have credit available to spend. Can you be professional please? I have paid my account and all I am requesting is for you to close it. I have reviewed complains from most people on hello Peter and it seems it’s a challenge to have an account closed by Markham. I will spread the message to the world so that they can know who they are dealing with. Please close my account and send me paid up letter ASAP. I don’t trust you anymore. If this is not done I will take legal action against Markham.