Airtel — pathetic speed of airtel 4g dongle/hotspot

What use is a net connection that doesnt provide you with the speed. I have paid for lte speeds and was promisedaround 40mbps and all i get is kb's and thats also not stable. These people fail to provide connection a metropolitan city like chennai around prime zones o[censored]niversities. Tells me a lot about the promises they make, which at this point seem nothing but mere letters coming out from their mouth with nothing to back it up with. I have a jio dongle too and they did not promise a flying net speeds but atleast what they give is respectable and stable. Dont just spit out net speeds in ads when you cannot back it up. This is why airtel is losing customers and just so.
I called up the helpline and as usual got a date extension and a complaint id, but we all know how that works. Never expected a major telecom company to be this ill efficient.

Airtel data card no:-[protected]

[protected]airtel complaint