If you're up for a suggestion, let every call go to voice mail. Instead of calling back, text back only if absolutely necessary... don't respond to manipulative stuff. There shouldn't be much you need to respond to anyway.

Him leaving a voice mail and you controlling WHEN to respond may help you not engage in his game. It also gives you a chance to think before responding instead of a phone call which requires a faster response.

For those times when in person conflict is inevitable, practice using a firm boundry... "It's clear we disagree. I will not continue discussing it with you." Then walk away.

It's empowering to be in control of your emotions and behavior. Walking away from his manipulations sends a clear message that you won't engage at all.