YOU CANNOT PAY YOUR ACCOUNT IN ADVANCE - NATIONWIDE for WOOLWORTHS

My monthly payment is R250.00 and I paid R1500.00 each month. I am months ahead with my payments. Now NATIONWIDE call me and urged me do pay my monthly instalment. I was informed that one cannot pay your account in advance. They also threatened to list my name at the credit buro's as a "SLOW PAYER" !!