POOR FIBRE DEAD SPOTS MOTHER BUFFER

I changed over from Mitchells Fibre to VUMA as my line has always given me a problem. Had to pay from R399 to R529 For a 40/10 line and we stay in M.plain. I kept sending speed test results to AFRIHOST they kept saying no fault they have reset the line same story over and over. I then spoke to Lesly on whats app and told her that the fibre is still a problem and plugged in only 1 laptop plugged in directly from the lan sent screenshot and still he problem persist with a 1 user connected PING 21 DOWNLAOD 15.80 UPLOAD 9.79 I have an old Mitchells Fibre hardware box which I told the lady may be the problem it is not compatible but no she does not listen. I NEED HELP ASAP