No resonse to request for early termination

I got an internet contract with MTN in September. Before I got the contract I asked the sales agent to check if there's network in my area as it is a new development. He called their coverage team and they said there's no LTE but 3G should work just fine. From the first day I was calling them and reporting that the network was terrible. It works better after midnight! They kept telling me a technician will come and assess but 2 months later no one has looked at the problem. About 2 weeks ago I started calling MTN asking for early termination because I use the internet for business so this network problem is costing me. On the 30th I spoke to Carlen (Ref no ***) and he told me the retentions team will get back to me. They never did. I went to the store where I got the contract. The guy at the store wrote an e mail to the retentions team telling them I want early termination. I asked him to call them because they never respond to messages. He said their retentions team does not work with phones. Are you for real? A retentions team of a phone company doesn't work with phones? Someone please help me because this is really frustrating.<br>