If you have been wearing them for a long time, natural wear and tear and your gait will certainly end up damaging the sole.
The soles of the Melvin & Hamilton styles are sewn in their great majority; it will be very easy for your shoemaker to replace them.
Check with him what he could propose in order to retain its character and its figure!
However, if you just got your shoes, it can be a defect missed by our quality service. Contact our customer service quickly, it will tell you what to do.