Airtel — Sms not going through

I am a very old customer of Airtel. I recharged my phone with Rs.2495.00 with all india numbers free + 2 GB per day data. I had to send an SMS to SBI on 567691to unlock my credit card. The SMS was not going. I was informed that this is a special number and that the annual pack of 2495 does not cover the said numbers for SMS. So I recharged with Rs.79.00 on 29.06.2021. Still the SMS is not going. I am 70 years old and cannot keep running to your office everytime. Your local office was not able to offer a proper remedy for the same. Do the needful urgently. My credit card is blocked.