RAIN AT IT AGAIN

I have had smooth sailing with Rain till 4 weeks ago. I have a Rain 1 router. The are I am in, has really good reception. Our phones, laptops AND TV had excellent reception - until 4 weeks ago. The phones and laptops still worked, but the TV had nothing. It shows that we are connected - excellent - but, we have limited connection. I have reached out to the call center, the tech department phoned me back and sent me instructions to follow. It didnt work. I phoned back, and the lady in the technical department that was supposed to help he - was just down right rude. She gave me instructions to follow, which I already had, just before we spoke on the phone. It did not work. And she claimed, that she had changed settings on my router from Rain's side...? It seems like they had changed settings prior, hence us not having any reception on the TV at all. This is getting rediculous, as I need to have use of my TV- having small kids and all. PLEASE ASSIST ASAP!!