New Samsung S5 loses connection, battery overheat

Problems connecting, receiving calls from inception <br> In constant comms with Precious and Thabi from Voda Hyde Park to try resolve phone issues - 4 separate visits to Voda Hyde Park<br> Phone and battery has always run very hot. Phone overheated and shut down, wouldn't re-boot for 1 day.<br> Clients could not hear me speak although I could hear them Clearly.<br> Phone persistently went off-line - frequent triangle indicating no cell connection. Temporarily rectified by multiple battery pulls.<br> Thabi Voda Shop Hyde Park also confirmed that <br> a. my S5 would not receive calls on \Ultra Power saving mode"and<br> b."