Scammers pretending to be Adobe with screenshots of my account....

Several months ago I recieved several phone calls and emails that appeared to be from adobe. The phone number even came up as "ADOBE SYSTEMS" on my call ID. 

They claimed we had exceded our alloted adobe sign digital signature transactions - this was plausible because I had a feeling we were getting close. I called the number back that was provided and the woman on the phone rattled off some of our account information. I did not give her any, no did I confirm what she said to me. I asked her how much additional transactions would cost and she told me based on the usage my company showed, it would cost us $4,000 a month. I hung up and I was never called back.

I contacted the help desk through the website and they didn't seem to be overly concerned about it. I did confirm that my companies usage was fine at that time and that we could think about adding 1 more license to the account to boost up the transactions allowed. 

This morning I recieved another email, this time with my CEO and GM copied on it (neither of their emails are on the account, the GM's name is but not his email as his name is on the credit card). They claimed we had exceeded our usage again and this time they had a screenshot of our users list.  

What the heck is going on here? Are people from the customer support centers in India leaking customer information to their scammer friends? How safe is our credit card info thats on file?