I WANT MY MONEY AND MY CELLPHONE BACK FROM CELL C

1.So I cancelled my contract last month on the 25th with cell c and I paid up everything, today they decided to debit me and they tell me about the 30 days period. 2. I took my cellphone for repairs last year in October which I'm paying insurance for but cell c is beating around the bush till today no one is saying anything about my phone.. I WANT MY MONEY AND MY CELLPHONE BACK FROM CELL C