Pathetic service

I shop often using Sixty sixty, it shocking the shoppers employed camt use common sense. I purchased plasters that wad on a 3 for 2 special however only 1 was available. Instead of using my selected 2nd option and choosing 3 of those so that I will still qualify for the special, the person chose 1 from. My original order and 2 from my second choice so now I pag an extra R100...this is really *****ing from customers. Shocking and pathetic service.