Pathetic attitude when at fault

I had purchased a shower room from Dolphin Sanware in mid July 2014 where my problems began with Dolphin Sanware especially with the quotation, I had issues with this unit. In the beginning of July 2015 the wheels of the sliding doors had come off. I contacted Shobana who had sent out staff to assess the matter, they advised me that the wheels are out of stock and will come through and replace them when received however after numerous calls and visits to the store I was advised that the items are in their possession, not to inconvenience anyone as it is the December period I offered to go to the store to collect the item, I dealt with a lady by the name of Tracy who tried to assist me the best way possible but when she phoned Shobana she was advised that i should pay R85 for each roller (All 4 of my bottom rollers have come off), there were other items that was faulty however my main concern was the doors as we have a 6 year old which uses the shower as well, I asked to speak to Shobana she refused to answer. I contacted the store when i got home and spoke to Shobana who was rude and prooved that she does not have any customer skills, she hung up while I was expressing my concern