Ridiculous Billing !

I've been with rain for a few years now ,and never had issues ,until recently . My billing is ridiculous!!! Firstly Rain is MONTH TO MONTH ,as ADVERTISED!!. So I couldn't pay rain one month and they were kind enough to still let me use the internet for another month . Now it is off and they billing me for 3 MONTHS ???? I understand I must pay the 2 months because you've given be the service .but for the past month it has been off and now that I want to pay ,I see im being billed for the 3rd month of service I never received?? . Called in to customer service ,the lady agreed with me that Rain is month to month .but she couldn't give me a reason as to why I'm being billed for 3 months when I only used 2 months .

I feel like not using them ever again ,HIGHLY DISSAPOINTED,AND I ALWAYS USE TO SPEAK GOOD ABOUT RAIN ..