Airtel — extremely poor service by customer care service spl

Dear Sir,
I am Col BP Panda having three postpaid Airtel mobile number( [protected], [protected], [protected]) and every month I am paying Rs 800-1000 towards my rental however the service provided by you and your customer care spl is very very unfortunate, the information provided by them are incomplete, false and having lack of adequate knowledge. Followings are the details of incidences happened in the last few days.
a, In the postpaid bill for the period of 17 Sept 19 - 16 Oct 19, the bill amount was Rs 1063/-. Rs 104/- was being charged for USAGE. I wanted to know the details about that amount from your call center on 05 Nov 19 during evening hrs. I was told by your customer executive, the amount is being charged for an international call from my number. I requested him to disable the facility of the international call from my number and other two numbers of mine. however, he refuses to do that and misguided that "this facility cannot be disabled and disconnected the phone. Again I called your customer care and get disabled the above-mentioned facility.
b, I am facing difficulty to call my home landline number[protected] from my Airtel postpaid number but it always shows invalid number, however, I can call the same landline number from my BSNL mobile no and from my landline number of Allahabad (UP). In this regard I lodged a complaint on 20 Oct 19 however 17 days has already over and no action has been taken and even today I am facing the same problem. today I wanted to call PNB C customer care however it was showing as invalid no but I able to spoke to PNB Customer care from my BSNL Mobile. In this regard, I called your service centre today evening at around 7 pm but the 1st customer care spl disconnect my call without listening to my detail problem. it is very very insulting and harassing too.
c, I bring this serious matter for your necessary action pl.