Woodlands — gv not accepted at woodlands shop

Address:

Erode, Tamil Nadu, 638316

I went to nearby woodland shop in the month of june 2019 and shopped for rs.2500/-. When i showed the gv to the cashier, he assured that it can be used for multiple times and used that gv for rs.2500/-. (Though the gift value is rs.5000)
When i visited the outlet yesterday, system is not accepting the gv and showing the message "gv already consumed". Cashier stated he cannot do anything as the system is not allowing him to enter the code.

After going through the t&c, i observed that the gv can be used only once.
But it was the wrong confirmation from the woodland outlet cashier, i had to use the gv worth rs.5000 to only rs.2500/-

Kindly look into it issue