Right, we are getting somewhere! Usually they pay you a week in arrears - so I do suggest, give them a ring, ask them when you are going to be paid since you started work on 6th December, so you will be due at least some money for December. When they tell you, clarify with them whether you are in fact being paid for that training week at the rate you were told. It would not be unusual for a new recruit to be unclear about some details, so they won't mind you asking. Do it now - set your mind at rest.