Sudden change of service delivery turn around time

I took my HP notebook in to Ensure IT services on the 26/02/2015 for repairs since it is still under warranty. I was told that the waiting period for collection for under warranty is 5 to 7 working days. Today is the 7th day. I called the office & I spoke to Poppy and she told me that I will only receive my notebook after the 30th March 2015 because the part they ordered will only arrive on the 30th. This is unacceptable and bad service if a part is obtainable around Joburg it could possibly not take that long. Also, I find the service given by Poppy very unprofessional. The first time she hang up on me, the second time she had my wait for more than 15 minutes. I hang up and called again and guess what? They did not answer. During my conversation with Poppy I asked to speak to the manager who refused to speak to me. He was on another call, neither did Poppy ask for my number to have him call me back. which is what service conscious companies would do. Even after I told Poppy that I would go to Hellopeter not even that motivated them. If my complaint is not resolved within this week I will pursue legal action against this company. I am a writer and I need my notebook urgently. Glen