Excitel — fluctuating internet speed

Address:	110067
Website:	www.excitel.com

I have taken 100 mbps plan, but when i'm checking the speed its showing 20 mbps for download and 85mbps upload, even the technicians don't know whats wrong.
It never happened before, i have been using excitel for 8 - 9 months and since i recharged my plan on november 27th 2017, it started this issue.

I dont know but i have used different service providers for internet and it seems every provider gives better service for 6-8 months and then it gets #.