Airtel — security deposit refund fraud

I moved from hyderabad to chennai a month back & i requested to port my postpaid from hyderabad circle to tn circle i visited airtel store 3 times to submit the address proof, collecting sim card etc but no one in store told for my address no postpaid services after 10 days address verification failed message came. I complained to appellate but i was told to change prepaid (Why can't they gave that suggestion when i visited store?) &i decided to move to different provider because of irresponsible support. When i asked to adjust my security deposit with outstanding so that remaining i will pay & close the outstanding but airtel executive told me that it will come as cheque after it ported to different provider with all the due cleared, during interaction i told i am not in that address & i moved to different city airtel told they will give a call to get the new address before dispatch cheque but no one called me. I discussed with customer care executive before making final due they confirmed that they will give a call for new address to send my money. After continuous compliant to appellate authority on 26th feb 2018 they asked me to share cancelled cheque to initiate neft & i do shared the same. The next day 27th feb 2018 executive called & said cheque was sent to my old address & it will return after 15 days if i am not receiving then after will process through neft if i approach them again with cancelled cheque, i raised concern again on 28th feb 2018 with appellate officers & on 2nd march 2018 i got call from executive saying neft was processed to account number when i asked about acc details she was saying some account number which i never hold, i told the same to that executive she dis connected by saying will get back, suddenly 5th march 2018 i received a mail saying i encashed the cheque hence cant process neft, i didn’t not receive any cheque, if i encashed i asked them to share cheque details & transaction details but no one answer yet.

I feel this is a planned/organised cheat by airtel, more than money they are testing my integrity.