Yes, HostMantis sold to DynamicHosting some time ago, so there will be changes hence community forum has gone down etc.
Did you not receive notification that there was new ownership!?
They should honour the affiliate commission regardless of new ownership.
Also, it is the weekend, and DynamicHosting may not have as quick support on the weekend, and if they are a much larger provider, the support, in general, may be slower. Maybe give it until Monday/Tuesday to see what they say.