poor customer service and poor signal

this is going to be the 3rd month im phoning after rain for my remind ***5 i was over charged for my wifi i then queried it they said within 7 working days ill get my money its already ***5 still no refund. ive logged calls online on the myrain app no call back im personally calling them every week and takes forever for them to pick up still for them to tell me retentions r like *** never have they had a issue with me paying them now they must pay me back i must beg for my money back. i upgraded to the newer router as the old one was giving me signal issues yet the new one is too i cant even watch tv at night the signal strength is so week not worth the money im paying their customer service is very poor