Who called from 6502004041

I have received a text message every 2 minutes asking to call this number on about 20 of my phones I manage at my business.  When I call can not get a human to void all communication.

I have received 8 texts from this number, and I need it to stop. Any help would be appriciated

Please stop texting you are doing haressment

Several TXT messages, "Health Care Credit Union-MESSAGE.  Your card ARE LOCKED.  Please call 650.200.4041 to unlock it."

Hello everyone, this is SCAM, I don't have any MasterCard ! Message received Dec 28 2011
"MasterCard-MESSAGE, Your card are locked. Please call 650.200.4041 to unlock it."