Travel agency not delivering on contract and promises

The Company did travel packages for the WC Rugby. They did a deal with us but then wanted us to pay more and with less benefits as according to them the price for the package changed?. At the end of the day I paid because of the urgency to get everything like VISAS and travel arrangements done.The MD agreed they made a mistake but will fix it. When I requested a refund for the part that I overpaid, they went quiet. I have had no response despite sending E-mails, leaving messages on their cell phones, whatsapp messages etc. I now need to go legal on them which I will do in principal but does not benefit anyone. Be very aware of what agencies promise and what you get.