MTN ROUTER INTERNET POOR

I am very frustrated with service delivery of a MTN router that i took a deal online and i received it the 21 Aug and on the 23 Aug it was connected because i was waiting for DSV to do the RICA. Since the 23rd August i made numerous phone calls to MTN also a lot of emails to try and sort out the internet. I was then told I must take the router to the nearest MTN shop to be tested. I took it in and the person that helped me said they can book it in and it will take between 2 to 3 weeks to be tested. When i asked what will happen in the mean time with internet he could not give me an answer because the deal was on online deal and neither would he be able to exchange the router. I have later escalated it to their complaints department and was supposed to get feedback within 72 hours which i did not. I was also being told i must take the router in but when i asked what will happen in the 2 to 3 weeks with internet again NO answer. I have not yet received any solution and that is what is so frustrating. They keep on passing the buck from this department to that department and then still i cannot get any solution. I send an email again today to coverage and again they say i must take in the router but again they cannot answer me on the time it will take where i will be able to get internet as they do not deal with that. I do not know what to do anymore just to get service as they say in the advertisment.