Ask them for thier QFE, keep clear of the ATZ.
Go on route and
them.
Its class G airspace you have done the right thing speaking to them. If they then don't give you a service/ or a !!!!e one. Stop speaking to them and keep clear of there ATZ as per the laws and then they might learn that its the good will of civilian who copperate with MATZ's and its is not controlled airspace.