Cannot see R 376,644.47 to settle my account

A payment has been made from the dealership from Standard Bank (I do have the proof of payment from the dealer), but WesBank keep on telling me that they cannot find the payment on their system. I want to close and settle my account as I purchased another vehicle and basically, this is a once-off \cash\" (EFT) transaction. Why do I only get the answer that \"they don't see any payments been made\". It is cleared at Standard Bank since last week (2016/02/24), but still WesBank cannot find it on their system! How can R 376,644.47 not being shown on your system??? I am worried like crazy what and where is that money! Can't get any satisfaction lately from you guys."