Nothing as such. They are lying.
Call this number 1800-123-1952 or ask them to call this number. Or raise a complaint against that saloon if you have proof.
-Question for payment arises only when your taken service value is higher even after redemption of all valid gift cards.
I just used 1.5k voucher last week. 1dt they said its only valid for spa services, facial etc. So i called the lakme toll free and they talk with the frontdesk staff and then she used the code for haircut+color and it worked. But they cut 1499 only. The staff said 1500 will not work fully. Re1 ka loss karwa diya. But baki 1499 was redeemed after half hr tam-jham.
By the way, voucher codes for Lakme mostly refer to discount codes.
Gift cards are different than those discount vouchers. Representative must have got confused. Gift cards are like cash only. Whereas discount vouchers (codes) are not.
Voucher codes are applied before applying gift cards. You can use both in the single bill. I personally used on many occasions.