Looks like I spoke too soon - my i5 promo was good for the whole of May, but since the first of June it's been atrociuos. Now I do not know if that's a coincidence or not, but I was still getting between 1 and 3.8 Mbps on the 2nd last day of May, when I ran out.
Now, in June, I have been noticing very bad speeds every day, and my speed only picks up to about 0.6Mbps, when it usually goes around minimum 2Mbps.
Could it be that 8ta gives new clients awesome service in the first month only?
This level of speed is really not acceptable.