Rain is a ****

I brought Rain in 2021 unfortunately I struggle with coverage in my area. Stop using it and lost the sim card it was April 2022 fast forward this year I get call from debt collector saying they are collecting on be half of rain. 1 I have no contract with Rain and it was month to month services so why I'm owning them? i was told I was supposed to cancel, but I had no contract with them and no services of data was rendered to me so Why must I pay ? I'm still waiting for answers and advert will say they is no contract which is lie ****