I've never been a fan of customer service gripes in public, although we happily deal with them. Instead if someone has an issue, best thing to do is pick the phone up or email us, we're not hard to get hold of!
But what about those companies that are hard to get hold of?
A while ago, we had our VAT number hi-jacked and a lingering consequence of this are rogue fraudulent websites set up using our details, which I spent ages getting closed down. But a few persisted, overseas ISP's can be unhelpful, and anything hosted in China, best of luck 
Unfortunately the directory industry doesn't have the best track record when it comes to correct data, ourselves included. Data is a fickle beast, there's lots of it, and it's always changing.
But a lot of site use automated scripts and bots to hoover up your data and generate listings, which you will have no knowledge of.
In our case, we ended up with a number of listings with some fake data and some real! So you try emailing politely, get no where and end up with the one communication tool that works, twitter!
All of a sudden progress! Stubborn listings I've been trying to get rid of for ages have suddenly vanished 
Does anyone else have to resort to customer service via social media, or are you on the receiving end and have to deal with customers who prefer to talk in public rather than contact you directly?
