bad service wasting my time

I went into the pavillion branch on Sunday 6/9/2015 to purchase the HP pavillion laptop that was on a vodacom 2 gig deal for R389 per month.The deal was valid, according to the brochure, till the 6th. I spoke to Shameer and he informed me that the Vodacom consultant was not in the store that day but will be there on Tuesday, and that I should come back then.I told him that according to the brochure the deal expires today , and asked him if I come back on Tuesday the 8th of September will I still be able to get the deal and he said YES. I then said not a problem, I will come back. I went into the store today the 8/9/2015 and was then informed by the Vodacom consultant that unfortunately the deal has now expired. I explained to him that I did come in on time but Shameer told me on Sunday that you were not available and I would be able to sort it out on Tuesday. He then said there was nothing he could do and suggested a inferior laptop at a more expensive price. He also took my details and said that when there is another special he would call.I did not want to argue, so I politely left the store. It was not fair to have my time wasted twice, due to internal issues, what do you think