Retentions and Cancellations department

After 2 attempts at an upgrade, my new cellphone gets delivered and I'm not allowed to get it because their delivery company (DSV) will not accept my drivers licence. I advised them more than once that my ID was destroyed and I was assured that my drivers license would be fine as long as I handed over a front/back copy of it. After sending the phone back with the driver I tried calling the retentions/cancellations department (more than once) with no answer. Waiting 10mins at a time to speak to someone. I would now like to cancel my contract with MTN. I would appreciate if someone could contact me to cancel this contract. I am happy to go elsewhere. Thank you