Worst Service Ever

My contract ended and I wanted to upgrade. I contacted the call centre the upgrade was done successfully and my cellphone was sent to my work address however on the same day that I upgraded I contacted MTN and said I no longer wanted that phone as I found something better and I was told that's fine but I can only upgrade again in a few weeks time once the cancellation was succesful. I contacted the service centre with the intention of upgrading, waited for 45 minutes for someone to answer then nobody could assist me because everyone was on strike. (at first this was funny for me... that nobody could assist but I thought ok be patient). Then I got my MTN bill, which was billed at R375 (keep in mind I don't have a new contract my contract ended) and they were suppose to cancel. I called in and was very nice again waited for 45 minutes and nobody could help me cause everyone was on strike. Gave MTN all my patience called again 1 month later and found out that the following month they would be billing me R610 and everyone was still on strike. (Anyone that could assist with the refunds.) I called again cancelled everything and was suppose to be refunded last week. STILL WAITING