Vodafone — Vodafone Constant Harassment after Port Out request

Address:

Y.K Nx, Virar West, Maharashtra 401303

I had ported out from vodafone in mid aug 2021 as there was no vodafone coverage for vodafone in my area, before porting out I had contacted customer care several times and even visited nearest vodafone center to upgrade sim as it was suggested by vodafone team but even after several follow-ups' there was no fix provided and every time vodafone person use to tell me give us 48 hours, Finally I ported out & before porting out my vodafone bill was zero rs but since porting out I am getting continuous calls from vodafone with unknown numbers and they are asking me to pay dues sometime they say 350+ amount and sometimes they say 850+ amount. Every time I have to tell them the entire story some of them agree and disconnect the call but some are very rude and unprofessional and they arguing and literally fight over the calls. Can someone where to take this ahead should I contact TRAI or Customer Court?