Skip MTN

I received a MTN Fixed LTE line, the address changed, I have never used it. I can’t access it. Now I don’t have the time to go to a branch, so it’s not even 2 weeks old. How do I go about cancelling it. And returning the entire thing to MTN, and apparently the customer care said that I can only change it once a year, what if work transfers you 3 times in that year? This was never communicated by the branch. Funny how things get left out. I have to pay for something I have no access to. Stick with Vodacom. Please advice me by today how a I go About returning and canceling this, I am still In a reasonable time frame.