XMPP protocol messed up after @handle and email change

XMPP chat is now broken for me on my main account, pms to me don't come and now a more recent development the chat does not work randomly. The other account keeps getting a 'Not Authorised' error when trying to connect. The issues started just after my email switched with my other account and the @handle on my main was changed, it could be either one or both, have no idea but support seems to agree with this assumption.

I think it was about 3 weeks ago I wasn't getting pms on my main account via XMPP anymore, never tried my other until I noticed the issues. I've tried alternative programs to make sure it wasn't Pidgin and the issues was consistent across them all so at that point I reached out to support. I have spent the last week with support, and I don't doubt efforts where made the issue since the start has only got worse. The recent patch or efforts from support have now broken it completely, I have no idea what happen but the timing was to close between the patch and supports reply. I was asked to post a bug report here, have no idea what I'm doing but I do it. To be clear I'm not blaming or bashing support, if anything I thank them for their constant aid with my issues.

I'm getting ever more frustrated as this was a big factor in getting a lifetime subscription, also, fireworks, those are great. The worst is people thinking I'm ignoring them because they can still send me pms, I just don't get them, I'll leave it at that but it's only getting worse.

Please help.