Shocking online delivery service

I am on crutches since a hip replacement and have had to use Pick n Pay's services for delivery. The first time the meat I was supp**** with was completely rotten (it was black) and I was told the only way I could get my money back was to go into a store and return it - on crutches??? Then yesterday my order of more than R3000 was delivered. The delivery guy didn't have a pen and we did not sign for it. However, when we checked it after he had left, we found we were missing 1 UHT milk and 1 packets of baby wipes. I phoned customer services to let them know, and was told it was \my fault