PicknPay do not give what they promise

PicknPay Hypermarket started a sales campaign on 1 March 2021. Clients can collect stamps, 1 stamp for every R100 spent. When you have enough stamps you can pick free Vivo glassware. Sins March I collected two cards of 50 stamps for beer glasses but for the past three months there were no beer glasses available! If PicknPay want to gain clients they have to give what they promise! Could this be a **** to lure clients to their stores?