LiquidCapital & a *******.

As a widow in her late 70's I was approached by a Liquid Capital rep telling me I needed an extended warranty plan on my 2015 Hyundai IXL. I bought it as a demo with 15,000km. At this time it has 54,000km on it. I told the rep it had only 50,000km which it did at that time. Nonetheless he convinced me that I needed an extended plan. In a senile moment, I agreed & they started deducting over 700R monthly from my account. What a surprise I had when I took my car in for it's annual checkup as the extended plan begins at 120,000km. I had to pay cash for that check-up. When I contacted Liquid Capital, they said they would reduce the km to begin the plan at 90,000km. I will most likely be dead by then. In their written promotion of themselves, they say they are "ethical" & promote "values". Their actions speak differently. How do I cancel my contract with Liquid Capital, Please!