CMA's Subaru of Winchester

I have neither purchased a vehicle from nor had a vehicle serviced by Subaru of Winchester and the sales staff has greeted me promptly and has been very friendly every time I have visited. My business has been entirely with the parts department and it is the absolute worst I have ever dealt with across any manufacturer. I have now been trying for 3 over weeks to get several parts. I placed my first order on Tuesday, 8/4, and was told everything would be in that Friday, 8/7, when I showed up to collect my order some of the items had not come in because the parts shipped from a different warehouse. I placed a second order for rear differential drain and fill plugs and was told they would be overnighted to arrive Monday, 8/11, and they would call me when the rest of my original order arrived. I never received a call. After hearing nothing regarding my orders for another week and a half, I stopped in again to see if my parts had arrived on Tuesday, 8/18. After saying they knew nothing of my order, they finally found a bag that had my complete initial order but determined my differential plugs had never been ordered. It took the parts staff 40 minutes to look up the plugs and place an order to arrive that Friday. Knowing how inaccurate their arrival dates had been, I did not go back to pickup my order until Wednesday, 8/26. I was handed two bolts in bags, one visually was correct but the other, in a taped not a factory sealed bag, looked very different from the original drain plug. I was told it might be a redesigned part. I took it home and determined the part number on the bag was correct but the bag had been previously opened and the correct part had been switched with another part. I returned to the dealership that same evening to get the problem solved, they placed another order for the same part number and said it was too late to order it for Thursday but it would be overnighted so I could have it Friday. Today, Friday, 8/28, I returned to the dealership again only to be told that the order did not arrive today and I should check back tomorrow, Saturday. This is by far the worst customer service I have received anywhere!