Attempting collection where their client owes ME!

Any ******* practices lately? OF COURSE, what else are you good at! Telkom OWES ME around R900 yet you are chasing after me threatening with adverse listings, etc. I've been fighting Telkom for at least SIX MONTHS and the last they contacted me, the "issue was resolved and case closed" so why the hell are you threatening me and harassing me? By the way, the ONLY communication received from you is a nasty email on Friday NIGHT to which I rep**** and you have not bothered to read my messages to you with PROOF! Now how can I harass and threaten you????