Over promise, under deliver

We went to Coricraft Tygervalley on the 10th November and obtained a quote for a couch and 10 dining chairs. We then contacted the sales lady that assisted us for an updated quote, as we saw there were items missing from the quote. On the 18th November, she called us to say that we could take the couch that we viewed off the floor at a 50% discount from the original price (it was already marked down 30% for a brand new one), so essentially an additional 20% off to take the couch from the shop floor, as the colour had been discontinued. We asked her to send the quote/offer through in writing, to which she advised that she could not, as her cellphone had been ******. We told her we would come in later that same day to make payment. When we got to the store, she told us it was now 40% off the original price. We told her that this was not the offer that was agreed upon over the phone, so after a looooong wait and a visit to her store manager, phone calls to the area manager, it was agreed we could take the couch at the original agreed price of 50% off. She then checked the various stores to see whether the dining chairs we wanted were in stock, which they weren't and she advised we would receive these in January as there was a 10-week lead time. We then discussed the couch. She said it could be coriguarded in the shop tomorrow (Tuesday 19th Nov) and then we would receive the couch. Then we made the payment, which included delivery fees. Upon confirming that the couch would be delivered earlier, she then retracted her earlier statement, saying she had spoken to her manager and it was too much of a disruption to the store to have the couch coriguarded in store, so it would be sent off the next day (Tuesday 19th Nov) for this process and then we would be contacted re delivery. On Friday, we called her at the store to follow up on the couch as we had heard nothing. She wasn't able to take our call and called back later that day, advising us that the couch would only be delivered next year with the dining chairs. We told her this is not acceptable, as it is NOT what we agreed upon in store. She said her manager wasn't in, but that she would have to refer to her manager and come back to us. We have now spoken to the manager (25th Nov) and she says that we will have "allocate the delivery" to the couch and then we will have to pay an additional amount to have the chairs delivered next year or she can deliver them to her store and we can collect them. We have told her to go ahead and deliver the couch, as we do need it urgently (we wouldn't have purchased it otherwise), but feel that this is completely unacceptable. This is a real case of over promise and under deliver, and it is such a pity, as we have a long standing relationship with Coricraft and have furnished most of our home through them. It is not acceptable to say whatever it takes to get the sale, and then renege as soon as the full payment has gone through. On a R45,000 order, surely all of our items can be delivered to us!