Help needed to remove established colony in Gingin, WA

Hi, is anyone on this forum able to remove an established colony in the Magnetic Observatory which is located in the Gravity Discovery Centre in Gingin WA. Has been there for about 12 months now, and we have tried contacting the local beepkeeping club with no result. We can’t even get an exterminator to go out there. Will pay a reasonable fee for its removal? Please get in contact if you are interested.