Terrible company ever. Lack of transparency

I’m expressing my deepest disappointment and frustration with the company. I signed up for a service plan and canceled in about a month. To my surprise the company refunded me less than half of the total lump sum I paid upfront, claiming it’s a cancellation fee. Out of R10138 they only refunded R4829, meaning their cancellation fee is R5309. My frustration is they can’t even give a sound explanation for it