10mbps, Downgraged to 4mbps without my Knowledge

Hi There

2 Moths ago Telkom downgraded my Fibre line from 10mbps to 4mbps. Since then im trying to get it back to 10mbps. But no luck! They keep telling me they are busy with the order, and it has been rejected. They will send it to IT! I don know what to do anymore. Because for 2 months they tell me everyday they will come back to me. If Telkom don't want me as a client, please cancel my contract, because Telkom changed my 10mbps line with out me asking for it, and i signed a 24month contract. And i know you are going to tell me you will come back to me, but nothing happens after that. I'm going to cancel my debit order, and i don't care if they take me to court, because they breached the contract and making changes on my contract without my knowledge.