Kiftsgate, at a guess - where did you buy it? Specialist rose grower or garden centre? A specialist grower would probably be able to tell you from what they had in stock at the time; a garden centre might offer some sort of compensation (it has been known to happen) as it was clearly mis-labelled.

You might be better off - I have been disappointed with P's H M - its lovely when in flower but it has such a very short season and I wish we'd held out for Rambing Rector instead!