BSNL — wrong adjustment charges for telephone instrument still not credited in my account.

Address:

H NO 18 RANI BAGH SATWARI JAMMU, Jammu, Jammu and Kashmir, 180003

I'm using land-line and broadband in my house and when i have installed it i. E in september 2019. I had used my own landline instrument and i have filled not to have instrument from bsnl because i have my own. But still they charge me for that of amount 529 rupees and i complaint it to my bsnl exchange and they have given methe application in which they had clearly written that it was mistakenly done and sogned by jto mukesh of gadi garh exchange jammu and he told me to give it to main office at bahu plaza. So i gave to mrs satnam kour at bahu plaza office on 18 october 2019. So till now, they had not adjustment of my amount and just giving silly excuses. So please i want to get my amount to be adjusted as soon as possible.