taking money from my account again

I have app**** online for a 4G router earlier this year and on receing the device i discovered that my property is the only property in Jeffreys bay that cannot have 4G.......... my neighbours has 4G but not me (according to the mtn coverage department). So the jbay mtn apparantly cannot take the device back and sent me on a 80km drive to the office in Port Elizabeth witch at the time was being revamped so they sent me to mtn greenacres mall where i had to argue for an hour to get the device returned. I have phoned customer care and received empty promises and sent a message on facebook and received no joy. They have taken R2795.00 and it looks like i still have 19 months of paying R559 for a device that was returned. Must i scream and swear to get attention?