Who called from 2177217626

I am getting the following text:  Shoppers:  Make $100/day!  Undercover shoppers needed to judge retail & dining establishments! No experience required. Call 866-918-3476 Re ???
How did these companies get my cell number?????  Will i be charged a fee if i reply stop to these messages?

Text from the above number stating, " Thanks for visiting our site! Call now for details on a $200 Gas Voucher!"

Text from this number- Thanks for visiting our site! Call now for details on a $200 Gas Voucher?"