My experience with rain was good until last year December, my connection started having a problem, my router is rebooting every 15 minutes

My experience with rain was good until last year December, my connection started having a problem, my router is rebooting every 15 minutes. Secondly my services have been suspended since the 26 of January while I have already made a payment, I sent all the details and proof of payment but up to now my connection is still off