FLAWED SYSTEM AND THEN BLAMES THE CLIENT - MAJOR BILLING ISSUES

Every month I pay my account with Supersonic, usually on the 26th of every month. Today I received a lawyers letter to say that I've been handed over for the amount of R539 and that I did not respond to any communication, I rep**** to them with proof of my last payment made on the 26th of January. My next payment is due on the 26th of February. Not once did I get a phone-call or an email from Supersonic to advise I didn't pay. I tried to phone numerous times and no answer. Instead, I have to speak to a robot via Whatsapp - what type of business is this? Handing me over to a lawyer for R539 after 3 weeks. Hoping this will get someone to give me a call.