Contract Cancelation

Cancelled my contract in November 2015 and there was a further R 400 deducted from my acount for 2 months. When't in to get it sorted out and was told I would get the R 800 back within 7 days. Well it is 2 weeks later and no money. Went to them agian and now there is some kind of sick joke being told that I did not give my ID number on day of cancelation.... (All their customer details are on their system anaway). I was told I would get my money now , but this is not how to run a buisness.