They won't stretch enough if they're already too tight. Can you return them?
Getting the same shoe in a larger size won't help if the forefoot is too small for you but the ankle opening is too big. Sounds like you just need different shoes.
The only thing you might check, I don't know those shoes, but on my old Specialized shoes, you could reposition the ratchet. It screwed on to the shoe and there were two different holes. If you can get the ankle to close enough by doing that, then maybe a larger size in the same shoe might work for you.
Speed comes from what you put behind you. - Judi Ketteler