Every few months I like to clear out my password manager of any accounts I don’t need anymore, usually just throwaway emails aliases.
I’ll usually attempt to log into any services that I know I’ve deleted/requested to delete to make sure they’re not accessible anymore and so far I haven’t been able to log in to any of them so I can only assume my requests are working.
I suppose if a service had a data breach, after my information was meant to be deleted, and I found my information there then I’d make a complaint to my regulator about not deleting my data. I would have proof of my request and their acknowledgement of the request so it’d be pretty silly of them not to delete it after saying they did
I rarely use anything but email aliases and fake information anyway and I never let online retailers save my card information. And if my address in on my account I change it to P. Sherman 42 Wallabyway Sydney before I delete/request to delete my account.
You could chance it, but they probably have logs of your IP/location data or they bought your data somewhere and so they could check, if they cared enough, but if you’re not an EU citizen and you live in an EU country then GDPR applies to you