awaiting phone repair

I have upgraded my cell phone contract with MTN Service provider during August 2015. I were issued with a CAT B15Q mobile handset which did not function correctly. According to the guarantee, the handset will be replaced within the first month. I have taken the handset on 05/09/2015 to the MTN outlet in the Mooirivier Mall at Potchefstroom. They insisted to send the handset to their technical department for evaluation. They said that I will get the handset / replacement within one week.<br> <br> After numerous attempts to get information on where my handset is, seven weeks afterwards, I am still in the dark and without a handset. I phoned several times the MTN outlet but nobody answer the phones.<br> <br> I hereby insisted now either a new replacement handset or I want to cancel my MTN contract without any penalty.