Airtel — service disconnected without prior notice

Good day mr or mrs airtel.
This is to bring your kind attention that my airtel prepaid service deactivated without prior notice. Kindly note that this happened 2 nd time in this year.
I possess airtel prepaid connection, no. Is [protected]. Yearly 3-4 months i have to visit abroad as my work demands. So i was not using my airtel no. From july 2018. However i recharged my mobile no.in between to keep it active.
Yesterday iam back to bangalore, airtel service was available and i used it. Did call to other no. And call recieved as well. Yesterday that means 25th october, around 8pm i topped up rs 499 via google pay. Money is deducted. As soon as recharged, airtel my no. Deactivated. When i spoke to the customer care, your top up is there in the system, you just need to register your no. Because registration cancelled due to non usage for 3 months.
Today i went to airtel outlet which is in kamakya bangalore, they said not possible to get the money i recharged yesterday. Also same no. To activate takes about a week.
I demand you to reimburse my money which i recharged yesterday 499.
Or else u activate the no. From your end.
It's really hectic to deal with your customer care guys, don't know anything.
If registration cancelled how 499 rs recharge done. Why do you took the money..?
It's a worst service among all network providers.
Either you activate my airtel no. Or good bye to airtel.
Regards
Ganesh