Not happy with service

When I signed up with Rain, I was aware that the service was month-to-month and that I would lose access to internet if I didn't make my monthly payments. That is the only reason I initially signed up for Rain. I misplaced my SIM card in April 2023. I had recently paid and had lost the SIM card early in the month, so I emailed Rain numerous times to request a replacement. As of right now, Rain has not responded to me. I stopped paying as a result of not having a SIM. A year later, Rain claims I owe them. How?