ADSL Speed

I logged an upgrade of my ADSL line from 4mbps to 10 mbps late August 2015. To date this line has not been upgraded and they have billed me for the 10mbps line. They said they would credit me this amount once the line was upgraded. Great... but still no date of the upgrade to be finalised. <br> <br> As of 09/10/2015 my ADSL line has been 320kbps and after logging a ticket, a live chat on 09/10/201 @ 17h20 and then trying to get through to the call centre (Holding for over 15 min) to resolve this issue I am still nowhere. I have called 3 times just today and still no answer at the call centre.<br> <br> Worst of all I recommended a friend and she got shifted around as well for two weeks before she got service...<br> <br> Where to from here? Another ISP???<br> <br>