Unresponsiveness of the rain billing department

I have had a worst experience with the billing department of Rain, since I requested the billing department to reconcile payments made to rain and even sent the proof of payment,But they made an error in billing and they did not record all the payment i made to them. I do not have network connection since then, even opted to return their router, I call the number ********** almost every day ,always getting empty promises that the proof of payment I have submitted will be looked at and my account will be updated accordingly, Or I get promises that I will get a call back,which is unlikely to happen ,or if it does happen, I have to restart narrating my story and get a promise of another call back.