Not everyone has a flashy website to lure you in to buy shiny bits, sometimes people trade on here as a sideline to proper jobs & can't always reply to you instantly.
You also say
Yet you only found out this morning they didn't fit.
Everyone makes mistakes, the way the deal with it says everything you need to know about the supplier.
If I cried on here every time a trader made a mistake, I'd have more posts than Sarnie