Credit cover cancellation

I have been trying to cancel the credit cover with Lucid Living since 2017 August and up to date they are still deducting my account. I went to a point where I was reversing from my bank account, the following month they will double deduction and threaten me with blacklisting me. I am talking about the very same company that claim to clear people's credit record and now they want to tarnish it. How do you blacklist a person for insurance if I cannot afford I cannot you just stop it. Lucid I did not take any product or service from you and I am not intending to. I do not owe you. Just cancel that credit cover that I have with you. The reference no is CON134301. Just cancel it.