I just wanna exchange my current ip6s with new unit (same model) with Trade-in-programme.

Yesterday I asked iFix @ Danga City Mall & Switch @ Bukit Indah, (JB), they required me to:
1. give the current phone
2. pay RM1680
3. They will need to send current iphone to KL so that can get new unit.
4. Within 5-14 days, if everything OK, I will get new iphone.

My concerns:
1. I thought I can get the new unit on the spot..
2. Why take whole RM1680 and left me with promises. if deposit, I maybe OK abit la..

Is there anywhere I can get iphone (through this programme) in lesser period,
and I only pay full when get new unit?

I'm in JB area.