MISSING COMPUTER BOX

I took my car an opel zafira for checking to the Car service city Sandton branch on the 14th .02.2014 for checking as it was showing a light of a car moving on a slippery road on my dash.I had to engage in manual as my car is automatic for me to get to the garage as it was moving very slow.I saw Danny and asked him to check my car ,Danny asked me to leave the car for checking he would give me feedback on Monday 16.02.2015.<br> I left my car and i got a call on Monday from Danny who informed me my computer box was faulty and i needed a new one, he quoted me R18000.00 to do the job to which i said i could not afford i will look for a cheaper option.<br> I called Danny on 19.02.2015 and told him i wanted to take my car for a second option to which he said i could pick up but had to pay R513.00 for work done so far. Saturday 28.02.2015 i went to pick up my car and paid the R513.00 but when i got to my car it wouldn't start as the computer box had not been put back i asked Danny for my computer box and he said it I could only get it on Monday ,I had to tow my car to another garage and wait for him to send my computer box on Monday come Monday they called and said they threw away my box.