Passing the Buck

I app**** for a loan and was approved. The consultant then called to say i was approved for the asked amount and quoted me the installment. I then accepted it based on the fact that I will be getting x amount and because I could afford the installment. They then made mistake which they admitted to making and and now I have to take out an additional loan so that they can cover the shortfall amount which they've not paid to me. Why should accept an increase in installment when they've already quoted me. I am not willing to pay for somebody else's mistake as that is not taking taking care of your responsibility. I think Standard Bank's Branch Manager should have gone through greater lengths than just to let their customer pay for their mistakes. Don't hold the client ransom for something you did. How's this,\If one's partner cheats and has a baby outside of that relationship