Unauthorized Debited funds from my account

Two transactions were deducted from my account unauthorized.i have been calling mango and they have advised that it's a systematic error on they part but two weeks later I still haven't recieved my money back !i have been sent from pillar to post by all mango departments involved .

I spoke to a lady by the name of chantel at refunds who promised to give me feedback by the 10th of November before close of business,when I call I was informed that they have closed and no one can assist me .this is unacceptable,this is theft from mango and I will be escalating this matter further should I not receive any help from