Apollo Pharmacy — Cheating from apollo pharmacy - Voucher code box deactivated

I purchased Apollo pharmacy voucher from PAYTM for 2500/- (2 weeks back and been calling the customer care since) as usual for purchase of medicines from Apollopharmacy.in I have been doing this for every monthly purchase until they have deactivated the voucher payment method. I feel cheated because if they are to deactivate, they should be informing PAYTM or other third-party apps not to sell them first, other than getting the end consumer getting stuck with the voucher. This is not just me but thousands of customers that purchase through Apollo Pharmacy regularly.

Desirable resolution

Reactivate the voucher payment method for all those who already purchased it. And if they want to stop accepting voucher payment method in the future they should only do it after stopping to sell it.

Thanks