Quote received and accepted. Supplier cant fulfil

In December 2014, we requested a quote for the transport of a large item from Underberg, KZN to JHB. Naturally the volume of the item was given and the address too. She quoted. In January, we asked for confirmation of the quote as 30 days had passed. She sent an updated quote with no change in price. We then concluded the deal for the item needing to be transported with our supplier and paid Xtra space as per their quote. Addelize thanked us and said the item would most likely still be collected that day. 2 weeks later and the item had not been collected not had we been contacted by Addelize. When we called to enquire she said the box is too big for their truck and she will have to send a bigger truck but it will cost us significantly more. We responded by saying that the quote was signed and accepted and she must collect it now. Its now been more than a month with ignored correspondance between ourselves and the National Operations Manager Geoff Westman. I now have no way of collecting an item for which we have already paid because of negligence on the part of Xtra Space.