WHAT CAN I DO? TRIED EVERYTHING!.... no service in home 15foot away in any direction away feom home 5Q

I need answers. I.was a sprint person got shoved into T-MOBILE and I don't know what they did to the customer service. I have times where I can't call or receive and contact then I will have to go out side walk 30 steps to my side walk restart phone either walk in and make call or stay out there. You can go from inside to.out with out dropping or outside in. And I usw wifi that I pay for from WOW who are amazing. To get the inside connection.  But my house alone is a dead spot. Sprint gave a thing called magic box that T-MOBILE won't recognize.  Let alone cause they look at the map and say ya you in a strong zone

.. come on over ill make a pot of coffee.. I got better stuff to lie about than a service I pay for continue to do.so for 10+ years.. fix please I am so sick of the routine just to make a call or someone says I have been trying ro get a hold of you for 2 days and it just keeps going to voicemail (don't get thw notifications cause I don't have connectivity.  Just fix. I have at least paid for some type of attention