Bad service from Glocell.

Hello Peter It is now 2 months that I am struggling to get Glocell to come and collect a phone that they delivered wrongly. I have phoned them about 5 times if not more to come and collect the phone and still noting. The phone is still sealed in its box and in a courier bag as my wife wanted to courier them the phone back after the first 2 weeks they didn't come to collect but they didn't want to allow that. I want to cancel the contract but can not do so until they collect the phone. My contract with them came to an end in April 2018 so I gave my 30 day notice as per my contract with them in the first week of March already. I already opened my new contract with another cellular company and also they are struggling to port my number from Glocell to them. Middle May 2018 I received my newest statement from them and I called again but don't get anywhere with them. What am I to do, please assist.