Vodafone Idea — Not getting proper service after reminder

I am getting full signal of 4g but its speed is like slower than 2g.even are unable to hear call proper, there is always a call drop in between. we are same issue from last 2 year but we helpless after lodging sevelar complaints.There are 4 connection of Vodafone Idea in my house, same issue is going on to every one. we are feed up with after lodging compliant with every one phone, but they are least both to solve the issue. They always tell to reconfirgation to internet setting in our mobile. they are not sending there field technical officer on the field where your has been setup your tower to check why the same issue is going on regular interval, I have change Vodafone number from Post to Prepaid due to careless behaviour and poor service even lodge the complaint but there is no complaint number is generating. i have not received any complaint number to track for my compaint from vodafone company. This means that they are cheating with customer by giving false information about Complaint lodge by us.

Request to you solve the issue on urgently basis