MTN and MONDO ruined my Credit Rating!!!!!

October 2021, Made an enquiry with Mondo online. Took a deal with them for a package. I got the router, it was not the one I agreed to, I called and was told that it was out of stock but the deal is still the same. I called again to enquire about the package as it was not adding up as to why my GIGs would deplete in two days. I was later told that it was pro-rata and I should wait until the 27th of October 2021. I waited and I got 30G instead of the 100G that I signed up for. I requested for the call from MTN and I was told that I should call Mondo. They made me call between the two companies and I GAVE UP. They never took the first installment and they took over R600.00. I reversed that and called MTN. They told me that the sale was made through Mondo so I must contact them. Mondo had system issues, again, I was discouraged and gave up. I wanted to return the router and I only used it in Oct 2021. Up until today, I have not used it. So I finally got the strength to deal with the issue again so I requested for the call. MTN said that I should go to the store and listen to it. Was told that the sale was done with Mondo so I should call them. I cannot be staying on the phone for more than 30 minutes of my day because I have to be at work and I have to do other things as well. I am tired of trying to have this resolved.