Refund Due

we have been doing business with mail & Guardian and we had 3 publications that we had to publish with them on behalf of our client and we paid them in full, then our client cancelled the 3rd publication and we already paid mail & Gurdian in full. then mail & Gurdian went and published the 3rd insertion without our go ahead then when we ask for a refund the lady by the name of Elsie Mashanzhe & the guy named Bryan Khumalo are refusing to refund us and they are ignoring our communication despite all the efforts we have been trying to communicate with them, can someone please intervene in this matter because my Boss is deducting the Refund due from mail & Guardian which is R13800 out of my salary.