Pathetic service

I have a 200GB contract with Afrihost. They sent me an email to say that they are changing from Cell C to MTN. I recieved my new device but it wasn't working. I asked for a call back on Sunday. I did see a missed call but they never called back. Yesterday I tried calling them and no answer I was on hold. I sent an email today, tried to get help on the WhatsApp chat and phoned but got no assistance. I held on for over 20 minutes and still no help. The whatsapp messages keep saying they have a high volume of chats and I'm in the queue since 11am today. Eventually a guy named Goodwill called and tried to assist. Apparently theres an issue with the sim card. He promised that it will be sorted today and will call me later. He calls me at 4 45 to say that the service provider has not replies to his email and unfortunately there's nothing else they can do. This is ridiculous service. I am paying for a service and getting no help to solve the issue. What also grated me is that I got an sms to rate Keith yet I never spoke to a Keith. This is not on.