Bad service

I paid for a dinning table on Monday, the 27th at Clearwater store. The slip came out blank and I was asked to email proof that the money went off my account, which I did while still there. For the past 3 days, they have been telling me that they can't issue an invoice to me cause they don't have proof that I paid and no table. Until I called their account section today then they issued an invoice. Unfortunately I still can't get my dinning table today, I have to wait. . I'm so angry cause, it is their machine which is not working. They said they had a similar problem on Sunday but they continued using the it. Instead everything is turned to me and I must be the one proving that I paid, really? This is so unfair, I swiped my money, left with a quotation only. Why use the machine which they know has problems?