Charging money for months of no services after the account have been suspended

Been having many problems since 2019 with this company. Paperwork net being done, Random dates on my NCR profile. Been placed under debt review 7 months after they ended the debt review process. Now 2 years later they threaten court action for money the claim I owe them after I paid them off in May 2020. They now threaten court action for services rendered from the time after May 2020 after they suspended their services. I have been paying my money directly. I had no invoices from them after Feb 2020. They do not respond to email, they blocked me on Facebook messenger. I CANNOT GET FEEDBACK !!! Yet, they threaten legal action for R6700 of money I know that I do not owe them.