Non existent customer service to long standing client

Non existent customer service from MTN is just disgusting! I have been with MTN probably over 20 years and I have been trying to upgrade my contract now for two months with no joy. I'm looking to get an iPhone SEmon contract but the phone never seems available, staff in various branches cannot provide any information when it will be available or can actually give you any service whatsoever. I then tried ordering at the online shop, twice, have so much as received a phone call in weeks, goodness knows what's happening with that. Phoned the call center, MTN direct, the woman was so rude and just told me the phones not available and nothing else. Disgusting service! I want to stay a customer but it seems you are intent on pushing your long standing customers away. All I want to do is upgrade?! Terrible service!