Here's the only way to stop these calls (only you can stop them).
Waste as much of their time as you can stand. Commission salespeople hate that worse than anything. While they're dinking with you, their paycheck is shrinking.
Tell them you're really interested, but your card is with your spouse. You can go get a statement. Take 10 minutes to find one, tell them it's a year old. You'll go find a newer one (10 minutes again, but you never find the 'newer one'). Give them a fake 16-digit number (VISA starts with 4, M/C starts with 5) that you've written down (so you can repeat it when it fails). Expiration date is next year, your name is (some fake name) and the name they have in their 'files' is for people who moved out.
Tell them your rate is 15.9%, you owe $8,000 dollars. When they question the 'wrong' number, tell them sorry, it's an old statement and that card was canceled. The new card is with the spouse who's visiting next door. You'll be right back. Don't come back.
They'll stop calling. Or, call their "Orlando" office at 321 332-0990 and ask the calls to stop, but no promises on that one.