mtn bad quality internet

home internet 30mbs is a load of bull the stories they tell you to reset restart or move the router is nonsense. internet speed for 4 min @ 25-30mbs then for 10 min 0 mbs the whole day through. tried resetting restarting router . Remove sim card do this do that bla bla bla and its just them *****ing money . no solution it cant be that for 4 to 7 min i get good internet and then its gone what does the wind blow it away. if you come to my house the wifi is called ***wifi coz it is ***. check out this clip evidence all there. https://youtu.be/gCUxBdsS-XQ