Poor service

I had a problem with broken Nappies and contacted spar and after a month recieved a voucher card on 5 September. No note of needing to activate the card so to spar closed to us to buy some stuff and a gentalman tried to active it for me but they are unable to active because the card is blocked.

How can spar sent a customer a voucher from just having a issue with there products and then the card is blocked. Plus no note of needing to active the card before hand.

Very poor service.