Worst service ever by Tavcor

Just for the record I stay in East London am a walking distance from NTT and I choose to service my car at Tavcor VW Port Elizabeth and have doing so for the longest time ever. My last service has been my worst nightmare. l found out that my engine cover is missing, the ring of my oil dipstick is broken and then air duct is missing as well. Reported this to Janine (service advisor)) as early as the following week, who sent the footage of the last part of the service when the car was being wiped and taken out, was not happy. Contacted Yolanda (customer care manager) who after following her up said she had escalated the complaint to Justin (service manager) . Once again had to follow up on Justin who said he was still investigating and will revert and never did so. Yesterday I called him again and he told me I cant get the footage as it gets deleted after a month and when I enquired about the verdict of the investigation, he said , out of good will they will give me the dipstick but the engine cover was not there and that I was accusing them of theft !!!!!!!!!!! My goodness , so unbelievable!!!!! I believe they are hiding something from the footage and don't want to take full responsibility. Also if they did not take out the air duct , then they failed to see that it was missing and hence inform me.