Haphazard Service Suspension - Contract

I am tired of having to block call to get my service unsuspended, i have not missed even one payment but my service keeps on being suspended. I am really upset and I cannot be bul**** every month. I have been making payments on the same day for the past year and a half but all of a sudden mid month my service is cut. Anyone who wants a contract, please save yourself the heartache, look elsewhere.