Cancellation and Billing Errors

I app**** for a cancellation for my 3G SIM only contract in November because I had a new LTE contract with you and I got my reference number ***2 in December. The reason why I cancel my 3G Sim was that the network was poor and the LTE contract had a better network connection. I then received a call from one of your agent called Suprise on the 5th of February who assisted me to close my 3G contract. He told me that the contract will be closed the same day and my data will be cancelled. He also told me that he will escalate my billing issue to Accounts so that they will reimburse me with my R299 as my contract was cancelled with 10GB data in it which was not used and I was billed for it. I was told to wait for 7 to 14 days for the Accounts department to payback my money but up to now nothing has happened. Today I got a debit order message saying that you have deducted my account twice( *** and ***) with R299 for the LTE account and the 3G account which was cancelled last month. Why I am not given my R299 for last month as you close my contract with the full 10GB data in it and why are you still deducting my account when this closed. You now owe R598.