Airtel — very slow internet, speed varies from 0b-2kb

Address:

1826/4, basant vihar, Panchkula, Haryana, 133302

I have been calling airtel for around 6 months and still airtel is not increasing speeds, the speed is commonly 0-2 kb, as a result, i started calling airtel when i was preparing for my 12 board exam, and they did not solve the problem, it's been july now and the problem is still not being solved, this time i will port my sim to vodafone and not gonna waste my 250 rs every month
I will advice my friends not to buy airtel sim