Airtel — Re issue number

Hello,
My name is Narinder Kaur.I am the airtel customer.My husband died last year and his mobile number [protected] was used for last 15 years.I have been using the same number for last 1 year because its connected to every government document and banks.But this year in May 2022 i was trying to port it to Jio Prepaid.I had paid my whole bill before porting but somehow Rs20 was left.And airtel stopped my port process and told me it will be resolved.Instead for resolving its they had surrendered my Number without any prior warning or notification and put up for re issue.I have tried to talk to airtel Sirsa but they are asking that i will have to buy this number again for 1.25 Lakhs.I cant buy it again for this Amount. Please help my in getting my mobile number back.

Thank you
Narinder Kaur