MTN BOZZA NETWORK NIGHTMARE

I took out a new data sim with MTN. I have a B525 router which I can use the sim in. I received the MTN sim on 19/07/2022. To date, I still havent receive any assistance. I phoned customer service since this past weekend and no one can assist. I currently don't have any connection and need assistance with setting up the sim card. MTN is by far the worst service provider. What is the use of having a simcard which you cannot even use and need to pay for each month? I have contacted the technical dept but dont get through to them. They keep on telling me that i am in my cooling off period when i want to cancel. Please HELP!!!