Tradus — Tradus cheating now

earlier I was happy with Tradus online shopping and even submitted some
positive comments about them here.

But now today I am just shocked by Tradus support.
They are cheating me for a small amount of rs.100
They canceled my order due to out of stock goods which
is understandable. But I paid part of my order with a Rs.105
voucher. They are not refunding me that amount. They are
just telling me to use the same voucher code again but that
voucher code is not working. I have tried again and again and
even sent them screenshots but they are just adamant to cheat
me for that small petty amount. Highly pathetic.
I will be forced to spread the word about this fraud site everywhere
now. How low can they get to cheat for small amount.