POOR CUSTERMOR SERVICE

I have a Mtn 10mb uncapped wifi contract. I got no help from them at all. The wifi keeps going off every few hours. Then I have to restart the router. They say on there side nothing is wrong so they don't know what to do or what is wrong with my wifi. It has been like this for 3 months. They said what they can do is take the router in to have a look, but then I will sit without wifi for 4-5 weeks and I still have to pay even if I don't have wifi. I asked if I can get a router in the mean time but they said no straight away without asking anyone else, Or trying to think of a solution.