Telkom billing me over R1600pm for over 4 years

3 mobile contracts ended, i havr been billed for them since 2017 and received threats that if i dont pay i will be blacklisted, Telkom harassed me over contracts that ended saying i must pay, i am 59 years old with so much stress and have to worry about bills i have ended. I need help. I receive a R1600 bill and telkom agents call and tell me that i must pay, the following numbers don't work ***.. ***.. And ***... All telkom numbers that don't work... My contact number is *** or ***... Please help me find out where i can get a refund its been over 4 years...