No resolve on bill

On the 5th of May 2015 i looked at my invoice for that month. There was a bill for R5280 (excluding VAT) on my invoice. I then switched the device off immediately. I tried to phone Autopage but there was no option to talk to a consultant. i then proceeded to write a mail telling them what the issue was (ref 672859) and that they need to phone me in order for us to sort the issue out. The automated response said that someone would contact me in 7 days. sent another mail (ref 685477) on the 13th of May followed by another (ref 690459) on the 18th May. 20th of May i managed to speak to Andrew (i phoned them). No resolve. i had no response from any of the mails i sent. I sent back the payment and paid for the call charges manually. Still waiting for a response from Autopage i checked my new invoice and there was an amount for R1500 (excl). the device was off for the whole month. then came ref 699177. No resolve. Not a single call from Autopage. ALL communications was from my side, nothing from them. ref 729969 is my last reference. 100% guarantee they will not contact me. What stand me to do now? any advise?