Home internet service is not reliable. What are my solutions? Family has terminally ill member who has online doctor visits.

Well I have had the same experience, my internet gets worse every day. Also when I went with t mobile is because I thought wow great deal with the rebate I called got it and they told me that I would get the $200 virtual credit card after paying on time and then checked to make sure that my email was correct. Well that's 5 months ago when I should have gotten the rebate at 90 days. I have to get the card so my son would have a birthday gift and then dinner, because we don't have money due to the fact that me single mom of two great boys I couldn't even imagine a day without them, anyway so I was not told anything except to pay bill on time and I have this whole time thinking that they were going to be sending it any day , but it is two days my sons birthday so I called and apparently I needed to register something back then and I was not told that  So I don't understand how I can just get told that I can't get it because I never did something they never told me to do, how could I since I was never told? I am a newly re diagnosed for the 6th time, I have been going through so much. I am a violent crime victim, so you can imagine how much worse this lie they told me was when I signed up! They sold me the crappy internet, lied about just having to pay on time. The company obviously doesn't value as customers because they won't pay it to me because they had an employee lie or wasn't trained correctly! I don't understand why they would have the customers keep leaving due to not good service and mostly because the lies are what made me sign up and going to be leaving. T-Mobile due to lack of compassion. I feel so disrespected!