I think it is hard to judge a business right now. My city, which is a major destination city, the leadership is all focused on supporting restaurants when they are only 5% of small business (defined either as <100 or <500). QTech could have an outbroke in the office and have disruptions in phone and work at home for some of their staff. Setting up, and maintaining, work from home operations is ,much more difficult for small business due to lack of economy of scale. That is part of why this entire Covid problem is a gift to Amazon, they are not just resistant to covid problems, say losing less business and gaining market share, they are actually phenomenally increasing gross and net sale and profit.
But with a huge number of items you can bet quadratec, Morthridge, Morris, Extreme are doing is drop shipping. Essentially very often the the product they are selling is a) the customer service itself, and b) curating catalogue of product, more than keeping it inventory, of so not getting any service is certainly a reason to complain. With Mopar product or almost any OEM I am never surprised to see wide swings in prices even among dealerships. I have found calling a couple of dealerships nets from 30% to 50% savings indicating the markup must be more than that. Since they already have an unpublished low price negotiated with insurance companies, some will give you that price while other parts departments will simply cite you the much higher suggested retail