Bharat Sanchar Nigam [BSNL] — Bsnl sim not recharging

Address:

Mundali

"transaction failed due to invalid service class"
I tried recharge from paytm and online portal of bsnl it shows me the above error. I unable to recharge because of this. I tried extended validity recharge and also talk time recharge but not done.
Please resolve this error.

I try to contact bsnl customer care number but they not reached.
Kindly request you to resolve my issue as soon as possible
My bsnl number is [protected]