We, too, had a combination lock problem the first day
in Tanzania--the lock got caught in something and tore
the zipper out of the suitcase and we had to buy a new
suitcase in Arusha! We purchased a plastic duffel and
the guide took the broken suitcase and I bet he had
it repaired at the same shop where we bought out new
one (they had sewing machines there and made luggage
Bottom line--don't pack anything you can't live
without. Carry on everything you need for survival.
And leave all the rest at home.