Account paid up - Still billed

I had a loan with Blue financial Services about 5years. I finished paying two months ago but I'm still billed for the paid up loan. I have tried to contact them and all their numbers do not exist. I even went to their offices yesterday in Salisbury centre Durban, they have moved and did not leave the forwarding address.<br> <br> My 5 years with Blue has been hell. The loan was a stop order, coming of my salary advice but they would still debit my account with the same amount same month claiming I skipped the payment. Now I'm worried that if they have been doing that for 5 years at least every three to six months will they ever stop debiting my account???