Airtel — network unstable

Address:

Mumbai City, Maharashtra, 410206

Last month i port my sim card vodafone to airtel, my mobile number is [protected]
I using this number since last 6 years, i'm not facing any network relataid problem s in vodafone, but since last month i ported to airtel and worst network i have used in last 6 years, when i raise the complain regards the network your people every week give me a call and he said network team will contact you in 48 hours, but i am not received any call from network engineer side. You guys giving benefit (Your unsused data will be carry forward for next month) but your network is very slow how can i use it it's showing 2g, 3g speed. So please resolve the problem as soon as possible or provide me details how can i port my number to other operater.