Official Coinbase support is non existent in my experience. There are people on the Coinbase Reddit page https://www.reddit.com/r/CoinBase/ who seem to be able to move things along if you aren't getting any support from Coinbase.
In Sean Parent's 'Inheritance is the base class of evil' talk Sean outlines an interesting way to achieve runtime polymorphism without inheriting interfaces in C++.
I'm more interested in the identity of the intruder for some reason. Who/what are they? Presumably there are easier targets to steal credit card numbers from, for example.