sadexpunk, I think thats because you cant do what you are doing, according to the smallprint (although it seems they have taken long enough to stop you)!
From what I remember, you cannot place an inplay bet that directly contradicts your pre match bet, which I think yours does, and I presume that is why they have stopped you.
I always go £50 pre match on over .5 goal, then inplay £50 on a draw. Any win nets you couple of quid, but 0-0 gets around £80 and any score draw gets around £130. Its still a no lose bet, and the inplay doesn’t directly contradict the pre match so you shouldn’t get limited by them 🙂