Unauthorized Charges from Coin Master - My Child Accidentally Made Purchases

I am continuously being charged on my bill due to purchases made in Coin Master, which my young child plays. The game seems to constantly prompt for purchases, and my child unknowingly approves them, leading to charges on my account. I am very upset about this and request that all unauthorized payments be refunded immediately. If this issue is not resolved, I will be forced to take legal action. Please address this matter promptly and stop these charges from occurring in the future!