At the tiny webshop/webhost I used to work at, we would just switch to a plain white page with a header saying "please contact accounts@host". Embarrassing enou

At the tiny webshop/webhost I used to work at, we would just switch to a plain white page with a header saying "please contact accounts@host". Embarrassing enough to push for payment, but visitors needn't necessarily assume foul play. Enabling people to save face is important - I doubt these fitness guys are going to be particularly cooperative after being shamed.