Was it EDI? I had a problem with a vendor where my store ordered something in 2015, marked it as not received, then received it later and sold it without correcting inventory.
The vendor went into a cycle of refunding and re-billing my store for that part every few months for years.
Fortunately both our books came out even in the end, but Jesus what a stupid thing to happen.
It was ultimately all of SW. Before the Valspar purchase, SW used SugarCRM, and my team there (TAMs) were with the account and regularly out in CLE. I really like the team there from SW. One of the best customers I ever dealt with overall.