Complaint Review: Delta Auto Protect

Delta is the worst extended warranty service I have ever worked with. This is what two repair shops have told me and will not work with them again.
First issue happened a couple of years ago. The shop called them and provided part they considered considerably substandard and they said they would not cover it if anything went wrong. They then did not pay the shop for months. They told me they would not accept any issue repairs that involved Delta ever again.
I have an outstanding issue I called in about in May. Alternator needed to be replaced. I contacted Delta prior to taking to shop and told shop when I brought car in. They never called me or the shop back. I had to pay out of pocket so I could have a car. This bill was around $800. I have called numerous times to be told someone will call me back. No one has called back. the 4th call in I was told to fax invoice for alternator. I have not heard back. Last 2 calls they said they would mark it as urgent and still have yet to hear back. I am out $800.
Now I have suspension issues. I let Delta know I was taking it in. Mechanic called in the morning and was told there was queue of about 4 hours. 8 hours later they have not heard back. This shop said they have never experienced anything like this in 20 years. This issue is looking to cost around $2200 and I need the warranty service I paid $2500 to cover this like they promised.
The customer service is horrible and goes no where. Looking at recent complaints this company is a sham and should not be in business since they either will not call back in timely manner, or they want to replace parts with substandard parts, or don't cover at all.