Rain contact/poor coverage

I have been with rain for the past 2 years or so now my router won't connect I've tried resetting and moving the device still not winning.ive logged so many tickets I have even lost count.went as far as calling them agent dropped the call on me yet they still debit my account monthly I can't get them to cancel nor assist me with my issue.i have an upcoming exam which I need internet access this is so frustrating