useless service!

i handed my phone in for repairs nearly 4 weeks ago at the samsung smartcare centre. i was told 7-10 days til i get my phone back. i did an eft and emailed through the proof of payment with my ref number. my phone is still sitting there untouched, parts not ordered. they do not answer their phones. i have sent countless emails with no response. i have no idea how to fix this problem now.