Paying for a service and parts that was never done

I took my Steed 5, 2Lt VGT DC for it's 40000 3rd service last week Thursday, and paid R3208 for this service, got home and after checking what exactly was done, I picked up that the Diesel filter that was charged on my invoice (R1000) was not replaced, I phoned GWM the manager just rep**** o there is filters here on the floor maybe it's yours, the second time I phoned he said to me that they booked the filter on my account and had put it in another bakkie, then he ask ME what else was not done?? I paid R3200 and my service was NOT done and my parts not replaced!! and this was not the first time with the first service my bakkie had they never placed one of the pipes back properly this caused the Turbo to break, while on vacation in Cape town, I lost my mother and my daughter her grandmother without saying good bye as my car was still in for repairs, I could not make it back to Joburg on time. There was so many times that you had cost me money , time and very big sadness, I was only told the first time sorry about your mother, this time NO apologies, you rather treated me as if I did wrong, I honestly think that I deserver much more than an apologies, Your ******* your customers.