Homeloan Relationship Centre Problem

I have app**** for a re-advance on my homeloan more than a week ago. The assessor came out and the person who handled the re-advance notified me that it was approved and the Homeloan Relationship Centre would contact me to arrange everything. I had to go overseas for Business so on the Call Centres re-assurance, I went into the Branch and signed all the necessary documentation. They said the Relationship Centre will contact me ASAP and everything will be in place. On Monday, Standard Bank contacted my wife and said the Re-advance Offer is going to expire. I am trying to get into contact with the Relationship Centre but I cannot call them and they are still not getting back to me. I need the money to be paid out and I am getting the worst service. I do not know what to do anymore to finalise this application so that it can move forward. This is now getting urgent and my hands are tied!