Hi nibir.mudai. Good that you registered a complaint and make sure you follow it up. When the sooo

called technical guy

arrives at your place, make sure you are present and watch what exactly he does. I will not be surprised by the fact that he will waste time by checking signal strength and also which BS [Base Station] it is connected to. Anyways, all you need is 1.5 mbps solution

and until unless it is not resolved, the tech guy is not going anywhere.
Airtel is always a primary option, if and only if its FEASIBLE. I am currently using 8Mbps AIRTEL. Honestly, it depends on each requirement and 2Mbps is a GREAT value for money product.
PERSONAL OPINION - Dont spend too much time bothering about TATA Wimax, bcoz of the fact it has (google)
1 followed by 100 zeros amount of problems . Time is money and you can use it for better resources.
I will definitely post upload speeds.
You Take Care. Thanks