Good on you, we experienced huge probs with Xtra when we were getting Broadband installed - what a bloody drama - and like you i let it rip. Next thing i had their top negotiator on the line trying to smooth it all over and whalla!! THen things started betting solved(after like 8 hours on the phonem me furious most of them).
Previus to that had to deal with the dickhead of a tech trying to tell my man (who is not at all it savvy) that we didnt need the splitter despite having a monitored alarm and me specifically getting appointment with tech due to needing a splitter GRRRRRRRRRRR then making out to Mr Negotiator he was intimidated and thats why he left, not becuase he was a slackarse.
Told Xtra it wasnt him they should worry about but me! LOL. Think once they realise you are not a dick and do know what you are talking bout - it SOMETIMES works.
Now to top it off we got go large too and we thought it was just us with it not working and going slow!!! So will be interesting to see what happens with the refund etc after their big SORRY spiel on news tonight. Good luck with it mate!