Think twice before taking a Telkom contract via DSL Telecom

I took a month to month Telkom contract in 2021 when I was working from home with DSL Telecom. The process was seamless and over the phone. Months later, I had to work from the office so I cancelled my contract and I owed nothing. I was surprised to get harassment calls from Telkom asking me to pay an amount that was shocking. I tried, a million times to explain that I had cancelled the contract but it fell on deaf ears. I called DSL Telecom asking for proof in writing and they emailed me, which I then forwarded to Telkom but still, the payment harassment calls kept coming. To say I'm frustrated is an understatement. At this point I even regret taking that contract with DSL Telecom because clearly someone from their department probably handed my account over based on false information. If DSL Telecom sees this review, please step in and assist. I keep a clean credit record and this is tarnishing years of hard work. It needs to stop because I have proof in writing that my account was settled.