Telkom NuDebt Management and VVM

I cancelled my contract with Telkom on 28 Nov 2019 (to be ended by 31 Dec 2019), ACCORDING to the contract! They then said it takes 2 months to end off the account, which is TOTALLY unacceptable. It's pure incompetence, and I am NOT liable for their incompetence! They billed me up to AUG 2020! That means they broke contract!!! After TWO years they started threatening me, first via NuDebt Management, and after I made various demands, a.o. that they clear my name from credit bureaus where they have smeared my name already, etc. they just sent another threat. This is ongoing from Dec. 2021 (NOTE: 2YEARS LATER) and then on 30 May they started to threaten me through VVM (a firm that is also called out as ******** here on HelloPeter!)