Airtel — Poor to very poor net speed

Now a days Airtel has become one of the worst telecom network.
I am missing very important calls, high rate of call drops and I have checked even though the network coverage is full on my phone the other end callers receive ' the no. u r calling is out of network coverage area' msg.
if i connect my laptop through wifi ( tried at my office and my home), the video plays second by second pausing each time for 3 to 4 sec and play for 1 sec only.