Laybye Complaint

I went to studio 88 in Tzaneen Mall on the 14th of November to laybye an item, today on the 7th of December I return to the store to pay the full amount and collect my item only to realise they gave me the wrong size. I returned back to the store on the same day within an hour asked for the item I laybyed and they couldn’t give it to me as they had sold it to someone else, how do you sell an item that has been laybyed to someone else. The laybye policy says three months but in my case I wasn’t even given 3 months to pay for my item in less than a month it was given to someone else, they accepted my money to laybye which was more than 30% of the expected amount but they could not keep it for me. What is the point of a laybye then. I didn’t expect this level of unprofessionalism. Anyone who does a laybye at Studio 88 expect your item to be sold when you return to go pay for it and collect it. I am so disappointed as this was supposed to be a birthday gift.