Professional Fitness Trainers not holding up to there part of the contract and holding me to cancellation fees. Raleigh North Carolina

I have signed up for personal training sessions at the beginning of the year. Since then I have been threw 3 trainers due to them not showing up on time or at all for my sessions. I have had 1 out of 8 successful sessions. I'm not happy with me treatment and want my contract terminated. There customer service representative has told me I must pay for some future sessions to cancel my contract. I do not feel that professional fitness has held up there side of the contract and I shouldnt have to pay for a service I'm not happy with.