SERVICES NOT RENDERED BUT WANT PAYMENT

My husband have a subscription with Rain on a month to month basis (So according to me that means no payment no service) that is not this case we have not used their services for a few months now but they are requesting payment. Now my question is why you are phoning for payment if no services were rendered (Sim card was and is not working) and this is a month to month contract. (With DSTV month to month means that you pay and you watch if you do not pay they switch your service off and when you want to watch again you just pay a reconnection fee and payment for that month not all those months that you didn’t watch you need to pay) RAIN IS *****