Closed account gets billed

I closed my JC account circa September 2015 as I was being billed a monthly fee that I never signed up for. To my surprise, in Jan 2016 I received SMS and emails stating that my account is overdue and I should settle to avoid my credit profile being tarnished. I contacted the call center via emai but they never responded. I then went to a branch and the sales lady contacted the call center. I was informed that the account has now being closed, but never got an explanation as to who activated it after I initially closed it. Less than a week later I am still getting SMS from JC, referring to me as an account holder. Clearly my account is still active, and now I am being billed the monthly fee that made me close the account in the first place. Tenacity group does not deserve any business from me as they are a bunch of *********** people. I never received an apology for incorrect billing, instead I get confirmation that the account is still active.