POOR SERVICE

I have been trying to get my debit order changed since April 2015 ... i have called many times, they blame the bank. I have now closed the bank account and advised cell c. I sent an email to complain and got no response. i emailed again and i got a reply to say \we tried to contact you but were unable to". I called customer services and was told the agent would call me in 1 hour. That was 2 days ago. Still waiting! My contract is up for renewal in a few months .... hmmmm what will i do?"""