He might not be wrong after all. I just tested Jazz 4G out of curiosity and this is the result. It's quite a surprise as it was really good.You sure your phone isn't the issue? Because so far, you're the only one with issues.
Not that I'm pointing fingers, but what I'm trying to say is perhaps the device you're using is bugged?
Also, it's odd how the upload speeds are much faster than the download speeds - if the signal strength is poor, the upload speeds suffer drastically. But this doesn't seem to be happening in your case.
Sent from my Pixel 2 using Tapatalk
The result wasn't extraordinary with jazz server either.
Sent from my Redmi 5 Plus using Tapatalk