I bought a pair of Cole Haan flats 3 or 4 weeks ago and the leather sole is starting to crack. The store suggested I get a rubber liner put on the bottom to prevent more damage. Granted I wear them 4-5 days a week to break them in but the cracking in the sole really bothers me. I haven't run into this before and think they shouldn't be cracking. Do you think the rubber sole will help or should I get them exchanged. The sole is pretty beat up and i am afraid they will get worse. How would I return them, if that is best? Thanks.