Airtel — money detection without any usage of the recharge plan

I recharged for rupees 499 after clicking browse plans with my number [protected] in the myairtel app link in online. But the money got deducted say this "this plan is not applicable for you money will be returned within 2 or 3 business days." since this plan is not applicable i have recharged again on 12 the august same day with 349 it got benefitted to my account.
Now that 499 rupees is still not re-funded
I have informed to the customer many times
Very worst service they are providing.
This is a very bad behaviour.
Refund the as soon as possible