NO RESPONSE OR HELP FROM TELKOM WITH FIBRE CONTRACT!

I have been on a Telkom Fibre 10mg line Contract since 2017. They upgraded me to 20mg without changes to the contract. When I decided last year to downgrade back to 10mg line the Wonderboom Telkom store ADDED an additional 2 years to my contract without my consent. Im now sitting with a 4 year contract that has technically already been paid off. No one online can help me and the stores system is always offline. Im very upset that I have to pay so much money for something I have already paid off. Telkom confirmed with me that my contract shouldnt of been extended with a downgrade but no one seems to be able to help. Im now moving to an area without fibre coverage and Im afraid Ill have to keep paying for something im not using. Shocking Service! Please can someone ANYONE help me to get off this contract!