MTN Killarney incompetencies

I am extremely frustrated with my MTN home router contract, which I took out at the end of November assisted by Nthabiseng at the MTN store in Killarney. Due to an error that she made, the router was registered to the wrong address, and as a result, it has never worked at my actual residence. Despite my repeated attempts to resolve this issue at MTN Killarney, I have received no proper assistance. And instead I was told that she moved to another store and they cannot assist me.

I have now been paying for a service that I cannot use for three months. This is completely unacceptable. I do not want to cancel the contract—I need a working internet connection. Since the current router does not work at my home, MTN must provide me with an alternative solution so that I can actually use the service I am paying for