Unfair treatment

I'm not happy with the service I received at Krugersdorp Fair price. I went there to layby a few items, but unfortunately, I was told I can't layby the items that are on promotion. That I understand, I asked if I could buy them all in cash, and the store keeps them for me until month end which will be convenient for me as I'll be moving into my new house. I was told that they will sell the stuff that I paid for, which is unfair to a paying customer. I then asked them to pay and bring my own transport to fetch my items. I was again told that I need to use their transport which is an additional cost.