Well there's thing. Even if Bitmex complained, Twitter has no justification to shutdown the account. Because it complies with all of their policies (and clearly states its not affiliated with anyone) [1].
Now, suppose it actually was Bitmex that requested the accidental take down, it still doesn't help me in anyway since I have no way to contact Twitter. Bitmex has a customer support that responds to emails and my experiences with Bitmex has been quite jovial since the start. In fact, Ben (one of the co-founders of Bitmex) has commented/reviewed some earlier versions of bitmexrekt code many years ago when I had some questions about the API.
Ultimately, the only way to get any support from Twitter is to make big scene on social media, and I really don't want to do this.