You will still pay convenience charges by phone. The only way not to pay convenience charges is to buy directly at the venue box office. There is no way to get around paying the building facility charge though.
In situations like this, it really helps me out that I don't allow myself to give a $hit. Pay the crazy fees, or don't go to the concert. I want to go to the concert, and figure the enjoyment is well worth the money. I am not trying to be condescending, or even sarcastic, just simple. I have given up on trying to be frugal. I'd much rather enjoy life. "It's just money."