Want our money bac****! very poor service

We have ap**** for a internet line at telkom the 19th of june wich we were advised to pay a deposit of R700 before they can proceed with the installation of our lines. We did so in the next 2 days after we have received our reference nr. After that we have received a date for the installation after calling numerous times. Our date was the 26 of june and no one contacted us or came to install any telkom lines and from then there were just said that we must wait... for that reason and that we have received no assistance we decided to cancel the order which we contacted telkom again to cancel our application and refund our deposit of R700.00. We have contacted then numerous of times and all they say is that we must wait and that someone will contact us back to get our banking details. We are still waiting and going on for another week. Can someone please assist with this...what can we do to get our money back... ???????????????????????