debit after cancellation and low credit

Hi my landline *** was cancelled in Jan 12 which i did not cancel. They debited me for the month of Feb to march for a cancelled line R267.98 which was line R165.79 excluding VAT. and R189 including VAT. invoice number:602C***T account no:*** invoice date:14 Feb 2016. They have only credited R137.21 excluding vat and R153.82 including vat on invoice 603C***T invoice date 13 March 2016 on land line ***. They should be refunding me R189 and the credit is on a cancelled account they should be crediting me on the *** on the account number *** invoice date:09 march 2016 landline ***. Also i did not cancel the line *** it was cancelled with out my knowledge. i paid in advance and i did not get my free month.