After making the payment, the instructor failed to arrange the classes, he would tell that he would call back and I wouldn't hear from him for weeks, until I reached him back to ask again.
When I contacted the customer's services complaining they just sent an email apologising but did not take any further action, either to refund my money for the classes I had remaining nor to book the classes with another instructor...
Lack of professionalism and respect for people's money and time!