MTN sim data

I am very disappointed by the level of service I received from mtn. I took a sim data contract with them, up until this day I can not use my sim. Yet it was delivered to me at work on 10/06/2021. At first they took they own time to activate for me, I had to call them so many times before activation. The whole weekend I had no connection because my sim was not even RICA'd and that I discovered on Sunday 13/06/2021. And everytime I call the mtn call center I have to ask each agent I go through whether they are on a new system or old system before getting assistance. Today i'm at work and I still don't have connection, I phoned them and now they are telling me that I was put on to the wrong package, which is fixed and I am using a mobile router. The guy who assisted me did not inform me of that. He just asked me if I needed a router or not and I said no because I have my own LTE router that I'm currently using. I am very very angry, I did not know that I will have such a hard time with mtn. And I do not know what to do with this sim card because it's no use to me right now.