MRP MOBILE SIM DOESN'T WORK

I WAS CONTACTED BY MRP INDICATING THAT AS A VALUED CUSTOMER I QUALIFIED FOR A FREE SIM WITH FREE DATA, WHICH I ACCEPTED, THE SIM DOESN'T WORK AT ALL, AND MY CONCERN IS THAT IN THIS DAY AND AGE NOTHING IS FOR FREE, I ASSUME THAT IT'S GONNA COME OUT OF MY ACCOUNT, TRIED CONTACTING THEM TO TELL THEM THAT THE SIM DOESN'T WORK, BUT THEY INSIST IN WORKS, SO NOW I AM SITTING WITH A SIM THAT DOESN'T FUNCTION, AND CONCERNED THAT I WOULD BE PAYING FOR DATA THAT I DON'T HAVE.