Its 25% on both adsl rental + data. Paid 525 for the last month and paid even less the previous month. they screwed up and charged me for 1mb uncapped with 25% discount. I had to call in and correct this... Yep my conscience wouldn't let it lie.
I have called twice now and two different people have the discount is only on the ADSL line rental. I'll be calling them again tomorrow and will keep doing it till I get the 25% on the uncapped portion.
A speed test confirms that I am now on 4MB http://www.speedtest.net/result/2820874873.png (weirdly my ping has dropped to 31ms from 50ms, I know line speed does not affect latency but the speedtest results say different)
Did some download tests last night and everything is all good here, getting +-400bps on everything from torrents to HTTP.
And most importantly streaming at 720p without a murmur
Thank you TI, now just give me my 25% off the uncapped and I'll be even happier