No Care Whatsoever for Customers

MTN is a joke. There is no customer service whatsoever. I will start from the beginning. In 2019 I got two mtn contracts. Everything went well for the first two months. Then somehow they managed to add a new customers line to my profile on their system and invoiced me every month for the extra line. For 19 consecutive months on the first day of the month they will cut both my lines because I haven't been paying for the third line which I didn't even have the device or Sim in my possession as it was delivered to the new customer. They would put me through to their accounts department and they will say they are looking into the problem. Two years later they finally took that third line of my profile and removed the excess amount from my invoice. Now in 2021 I am upgrading on the 19 of August, lone behold they put me through the whole process of getting a new contract and it gets approved. Nobody notified me that it's been approved but unfortunately they do not have stock of the device that I wanted so they then canceled my upgrade again without any notification of any sorts to me the customer. I then have to reapply for the upgrade and go through the whole process again to get approval. I ask the consultant that helped if there is stock of the device I want and assures me they have got stock. Two weeks later still no delivery so I start phoning them everyday and get told that there is no stock but If I want to I can take a different device but unfortunately the only person that can do this is the consultant that processed my upgrade and she is currently on another call but will call me back asap. Three days later and I am still waiting for her phone call. MTN has by far got the worst customer service of all the networks.