I too bought a pair of MBTs two years ago. Took a while to break them in but when I did I found them excellent. I needed to get them repaired/resoled after a couple of months (I was doing approx 8 kms a day). When I went back to collect them from main mbt centre in Glanmire, Cork I was informed I was walking incorrectly on them. To be honest I am very heavy on shoes and wore the resoled ones out quickly again and had them resoled again only to be told I was still walking incorrectly, which I already knew but still found them excellent for toning. AFter they got worn out I bought new pair but still haven't gotten round to breaking them in!
I'm sure their website has contact number for the office in Glanmire if you want to present your case to them.