[Resolved]  Idea Cellular — very poor internet speed in actual but showing up to 15mbps

Address:

Mumbai City, Maharashtra, 400033

In my plan i have been informed i will be provide 4 g speed data and when i check the speed on speed test site, it is showing the speed up to 15 mbps. But when i try to listen mp 3 song or try to watch video on youtube or even surf something on net, it takes too much time like 40-50kbps.
The same sites when i open on same location and on the same cell or laptop it open very fast using other networks like reliance jio and vodafone even their speed is showing too less on the same location (Ex - up to 3-4 mbps).
Idea is cheating with its customers.