Airtel — recharged twice by mistake

I recharged with 448 rs plan (For which i paid 398 as i had airtel coupon of 50 rs) and i got a message of successful recharge. However when i started my internet it did not work. So i checked on airtel app and it was not reflecting the new validity. So i recharged it again with same plan and still internet is not working and validity is not reflecting.

Kindly check and when resolved kindly refund my 398 as i need only 1 plan activated.