Melaleuca inc. i cancelled the membership but still sent me two orders of product that i sent back ,put me over the limit and is claiming they only got 1 box back idaho falls, Idaho

I cancelled the subscription w/ Melaleuca back in Oct. 2012 and they kept denying that they rec'd the fax of cancellation , in turn billed my credit card twice and put me over the limit . they shipped  two boxes of product and the acct. was clearly cxled and  both boxes was shipped back to them . They have since gave me credit for one order return after me insisting to speak w/ a manager. They are claiming they have not rec'd the other box back. Unfortunately my boss who signed me up as a member offered to ship the package back so i did not have to pay the shipping costs . She can not find her receipt from the post office , But assured me that she sent it back . I asked one of the managers there to please check w/ the ware house still have not gotten a response i keep calling their but i feel i am just getting the run around.This should never had happened in the first place since this acct. was cxled . I am getting all kinds of fees from my credit card company because they have put me over the limit twice.  I even had to change my credit card # and blocked this merchant from being able to bill me again.So i am still waiting on one credit due for $64.65 and i have rec'd 2 over the limit charges of $29.00 each . And this is not fair to me.I don't know what else i can do. Thank You Laura Maragni