I've asked a Comcast employee to help you. You should expect a reply in this thread.
FYI: They owe you a $20 credit for every tech visit after the first for the same problem.You can also get a credit for your service from the time you first reported the issue until it is resolved.
Hi saurabhs619, I ran some tests on your signals and I don't show anything in your area that is impacting your services. Can you please send me a private message with your full name, street address, and account number by clicking on my name (ComcastAmir) and then "private message me" so that I can look into your in home network?