Vodocom wrong number upgraded

Good day Vodacom, I'm trying this as a last resort. I've been a loyal customer for many years, and I have never had any problems with the service you provide. Up until now I have had no reason to complain about anything, and thought of you as the best cellphone network around. I did an upgrade on my phone in May this year, the devices that I received is 100%. The problem is that they upgrade the wrong number, they upgraded a number that I canceled as soon as the 2 years was over. I contacted customer care as soon as I received my first bill. They advised me that they will have to collect my devices in order to cancel my contract and reinvoice the right number. For over a month I've been carrying both devices in their boxes with me waiting for them to come and collect it. I've spoken to numerous agents in the cancelation and after sales department. They kept on telling me that there is 2 requests for collection logged on your system and that they will come back to me. I phoned again today and after sales transferred me to cancelations, the agent told me that they can not collect the devices as more than 14 days has passed. At this moment my account is R811 per month were I agreed on about R550. Please assist me, I can not afford to pay that amount, the mistake was made on that side when they upgrade the wrong contract. Hoping to hear from you soon. Regards Elize ***.