Incorrect billing

I hadn't used my rain in the past 3 months but they keep billing me. They called the 1st month for non payment and expressed that I wasn't gonna pay them because I'm financially strained for a few months then they said okay. But the billing keeps going up. I've asked one of the agents that called me to send me the usage of my account since they claimed I've used it then the lady I was talking to said they'll check and come back to me to confirm.if the isn't usage but I'm still waiting for them to come back to me. 3 monrhs later. Now I wanna pay for my rain but I cannot pay for something I didn't use. Why are you charging me for not using the SIM card. Please fix the billing issue and send the right amount so I can pay that. I know tueagebts generally don't care for their customers but I'll wait for their call