Where can I find a specialist phone repairer in Marion, Adelaide

Who / where can I go in the Marion region of Adelaide, South Australia to get my Samsung Galaxy Note II repaired?

- The phone battery doesn't last

- The phone gets jammed and cannot turn on/off

- I've recently downloaded "360 Secure" to get virus checked, files cleaned, phone boosted, etc - It is telling me that my phone is working within 95% capacity -