Bad service

I have the same problem each year when I order contact lenses. First of all, I went for eye test beginning of Feb 2015 for glasses and contacts, I ordered the contact as well and I made an appointment for my son for his eye test on 1st May 2015. Monday I got a call saying they made a mistake with my son's appointment because it is a public holiday (which I didn't realise either) but they could only help me on 18 May! I was not happy at all and went to Centurion Mall's Spec-savers to find out if they could assist me. They helped me with an appointment 8 May for my son, without ANY problems. Also when I spoke to a lady on the phone, I asked about my contact lenses which they phoned me back to tell me they NEVER ordered the contacts. I was furious. They told me they would order it and I would get it Wednesday, which was yesterday. Later on Monday I got a call again, saying my lenses are out of stock at the supplier and it would take ANOTHER 3 weeks but they will order 3 pairs of trials which I can fetch Wednesday (yesterday) and I asked them if I can hold them to Wednesday as they have a different story each time. Today is Thursday and I didn't hear a word from them yet!!!!