Another one from this network provider regarding MONEY

Well Cell C you never seem to stop being pathetic. On 27 October 2017 I made a payment of R500, about two weeks later I receive threatening emails regarding an apparent "non payment", I've emailed and I've phoned however your operators are useless too, I've sent proof of payments numerous times, I've even gone to a Cell C store to complain and I was told that the only thing I can do is email the proof of payment again. YET I still get threats sent to my mother and to myself as Cell C now wants to blacklist me, well I say do it cause I refuse to pay anything else to you unless this issue of 3 months is resolved. Which I highly doubt as employees at Cell C are *********** and absolutely useless unless Cell C demands money then it's easy to contact their customers.