No SIM card

I was recently contacted to upgrade my data contract. I agreed to an upgrade to a deal where I get 100GB any time data, and night time data. I asked the caller on more than one occasion during our conversation if a SIM will be delivered as well. They kept assuring me. Needless to say, no SIM. I don't have a car. I barely ever leave the house which is why I requested a SIM to be delivered. What next? I wanted to cancel this account because previously I didn't use it, for exactly this reason. I want a SIM so I can use it as a secondary in my iPhone.