heh, serious though, calling them and burping over the phone and calling him a *** on his voice mail may be fun and all but it's not going to get anything done.
Same goes for game play specific requests.
Calling him and saying put this in, change that etc. is a waste of time.
Instead, inform him of the large number of customers who are displeased with their product and tell him where to go for collective feedback from the customers.
Type out an e-mail and provide some links to some of the rather large threads on various forums where disgruntled customers have repeated over and over the issues the game play has and then call that number and inform him of the e-mail you sent him.
At the very least, remain professional and keep in mind he's not going to be sitting there with a pen and paper as he listens to his voice mail and going "ok kicks back in, check".
Just point him in the direction of as many bug/game play issue threads as you wish and let them see first hand what is going on.