Did not leave a message which means they'll be calling back.  Blocked!

Asked to speak to the person in charge of merchant accounts. I told him we were not interested and he proceeded to get sassy and said 'how do you know you're not interested, I haven't even offered anything to you yet". Said 'no thanks' again and just hung up.

Calling our business again. It's a credit card processing telemarketer, and they are all shady. Just hang up on them because if your business has a voicemail that comes on after so many rings, they will know it's a legit business and will call again.

same here  3 rings no message

I actually answered this call. Some guy asked to speak to the person in charge of our business credit card machine.  I told him 'he' was out of the office and would be back at lunch would he like for a call back.  He said no that he would try then. I went to hang up, he started with, "Well, can you confirm that your business still accepts credit cards?" I hung up then because I knew he was going to go on and on.