we want our money back

My friend and I registered with damelin correspondence for an ICM Credit management course and were advised that our study material will be delivered to us within 21 days after registration to no avail, we have since been calling them on a weekly basis to update and we have been told the same story that the study materials are in the warehouse awaiting delivery for over 3 weeks after the said 21 days. The consultant Felicia even hung up the phone on us when we called to enquire about the cancellation process , the College has started debiting our accounts without the study materials or contact with regards to the delay. We would like to get our full Deposit and the money they have debited from our accounts.