Sick Ornamental Orange Tree

[Don & Laurie Cobbett]

I recently purchased an orange tree.  It was in a pot far too small for
it so I repotted it two days after purchasing it.  Five days after
repotting I noticed the leaves were starting to curl up, now all the
leaves are curled up and the poor thing looks dead.  It has been getting
water on a regular basis and has been receiving sufficient light.  I
can't figure out what is wrong, can anyone help?

Thanks.

Laurie