Faulty Phone

In December 2014, I upgraded my contract. On the contract I relieved a Samsung S5 mini.<br> I received the phone a week after because of logistical reasons.<br> From the start the phone gave problems such as:<br> Whether a call was made or received the phone cut off after 1 minute sometimes 3 minutes or 6 minutes.<br> <br> We took the phone back to Autopage- Brits. The owner's response was that the '7 day out of box' guarantee expired. They send the phone in for repairs, after 6 weeks we got it back with the reply that the software was updated. Still the problem occurred, the phone was sent in again, after a month the phone came back same reply. After the second software upgrade the phone still gave the same problem. We sent an email to Autopage head office explaining the whole incident. Their reply was that I should take the phone to the Klerksdorp branch, which is 3 hours drive from Brits. Till today I'm still paying the contract every month with no usable phone. This is my last resort to get this issue resolved.