Spam Callers using most of our minutes

We ran out of minutes on our plan this month due to the amount of spam callers calling in to our number. I have been working with support to have theentl system hang up on the robo caller if no prompts are pushed. The problem is, the greeting has to run 3 times before the call is disconnected. Which again, takes a few minutes each call to go through. Curry there is no way they can make a change to disconnect after the first message. I am hopeful that someone there will address this issue before we have to change providers.