reapply direct with pbb

submit more documentation to help support/strengthen your application

Bad experience with RP.

try to reduce credit limit from other cards that you will not need high credit limit.
Then reapply again. I found doing it this way helps to raise the chances of approval.

4/7 - Submitted to RP
17/7 - Keep telling me they have submitted to UOB
2/8 - UOB confirmed nothing received
5/8 - Submitted to UOB directly

I applied via RP on 21 July. RP tried call me over several days (missed call) finally in the end I manage to pick up for phone verification.
No news from PBB so far, but I can see in CCRIS got PUBLIC status=Pending

I was in that situation when I applied for Quantum Master, first time with PBB.  My credit score was good as I always paid on time and I met the income level well, yet I got rejected.  I asked for the reason of rejection and all I was told was "management decision".  I asked if the bank could reconsider, the CSA so kindly said he would put in an appeal request for me.
Meanwhile, I paid extra towards all my cards before the month-end so that my CCRIS report would look better i.e. lower utilisation rate.  I got the approval message around 10th of the following month when the status of a few of my cards were uploaded on CCRIS.   
You can try doing what I did.  Don't despair and be patient.  I guess PBB cards are so much in demand that any thing in your application that they don't like they simply put aside.
I applied direct.  I don't know if it is any different from applying via Ringgit Plus.