Pick n pay Sandridge

Pick n pay new policy with no exchange or refund on cigarettes is unacceptable. So this morning picknpay sandridge totally refused to exchange a packet of 10s cigarettes for a packet of 20s even though i didn't yet leave the shop. The notice for this policy was on the wall which was not visible at all until the supervisor showed me. If i left the shop with the cigarettes and came back i would understand and accept the rules but while I'm still at the till point i get NO answer.This store maybe convinant for me but after this experience I'm considering of not going back there. A regular customer at this store everyday and all through a packet a cigarettes that refused to get exchanged. Very unhelpful staff that's quick to say NO. Totally unacceptable and is this what i call Customer Satisfaction?