I wouldn't expect to get any sympathy from a business/corporation, but my idea was to try to contact Alexey Pajitnov directly if possible.
There are dozens of Tetris clones on Google Play, but they seem to be targeting your game specifically and as I said - it's likely because they see it as a threat to the official one. I think they should be trying to improve the official one rather than use copyrtight as a weapon against competition.