Autopage unwilling to pay back incorrectly billed

I ported my number from Autopage to VodacomSP on 15 Nov 2014 (after my contract expired). The porting process was painful! It was rejected 3 times and them all of a sudden, after plenty angry phone calls went through without an apology or explanation. After this, and moving onto the real issue, they continued to bill me on 28 Nov and again on 31 Dec. They also took the debit orders from my bank account. They probably look at this as a system error or inefficiency, but in the real world, it looks a little more like theft, unless they are willing to correct the mistake QUICKLY, off course. Not the case. I contacted them and logged a call in January (ref 562447). This was closed by them on 22 January, but instead of getting money back, I got another bill on 30 Jan. I phoned them back on 2 Feb and asked that the call be reopened and escalated. It apparently was and I expected a refund. When I followed up again on 19 Jan, I was informed that the call is resolved again. I was put through to Accounts but hung up after 20 mins in the que where my call is off course important. This is shocking. Pay back the money!!! Pretty please.