Termination of contract past expiry date

On 1 March 2015 I requested the contract to be terminated as the upgrade was denied ( back office) after being a client for 4 years. On 15 March 2015 I went back to the store to confirm the termination and was told it has been successful. I phoned the call centre on the following dates 06/04/2015, 02/05/2015. 11/05/2015 incl today 19/05/2015 and get the same response every time \The case is at the back office and will be contacted". No straight answer as to what the hell is going on"