Dishonesty of Mr mobile agents

A lady from Mr price called me and told me that they want to give me a Sim card as a thank you for me not missing my payments and always buying in store plus online at Mr price. They now deliver bit to me today but it written Mrp 100 plus @R100 PM*12 months subscription. And I even asked da lady if it's not a contract and she said yes it's not, it's just a gift they offer to their customers. Can anybody from Mr price explain what kind of gift is this.