Email and Fax being ignored/lost

I have a contract with Elite Mobile. I have done the payment for a sim swop and cancellation of the contract on 30 March 2015. The proof of payment has been sent through on multiple occasions. I keep getting feedback that they have not received it. I have requested that a manager gives me a call to assist. Which is being ignored. Please can someone sort out the issue with the mail/fax and cancel my contract with immediate effect.<br> <br> Regards<br> Emily Motla