I have purchased 3 very expensive new cars from Ji...

I have purchased 3 very expensive new cars from Jim Ellis. The experience has gotten worse each time. I won't even go into the past experiences but I had chalked them up to bad luck and went back anyway. After all, it is family owned, local, "expect the best", etc. So, two weeks ago I reached out to trade my Suburban (bought from Jim Ellis.) for a 2021 Tahoe. Sales told me via email "these are really in demand and you need to put a deposit down." I wrote back that I would be glad to do that. Let me know how. No reply. So I called and was put on hold for 15 mins until I finally hung up. Meanwhile the trade-in contact did get back to me quickly with an offer - it was way low but at least it was fast.
So I sent another email to sales and no reply. I guess business is good but I mistakenly thought my loyalty might curry better treatment and maybe even a chance to be among those early to buy a 2021.
So with no reply from Jim Ellis I reached out to another GA Chevy dealer. I had an offer on my Suburban and a price on the exact 2021 Tahoe I wanted within 15 mins. The paperwork was done in another 15 mins. and the car was delivered to my office by noon the next day. By the way, the offer on my Suburban was $3000 MORE than Jim Ellis Chevy offered me. No hard feelings as I got the car I wanted elsewhere in a great transaction. But it continues to go badly...
Since then I ordered some accessories from the Chevy website to be delivered/installed at Jim Ellis. I guess I am a glutton for punishment but they are really close to my house and I thought it would be a simple transaction. Of course they didn't call me to tell me the stuff came in so I called to confirm the accessories had arrived. The parts department told me they had them. I showed up at the Service/Parts department today and they cannot find the accessories. Wasted trip and I am not even sure what that means for me now. Seriously, this dealership could not be less competent. I guess they sell a lot of cars with good advertising and a convenient location but after shopping elsewhere it reminded me how badly I have been treated at Jim Ellis. "Expect the Best" is a nice catchphrase that has not been a part of my experience with 3 purchases. I'm done.