Bad attitude from nedbank about personal loan

I've app**** for personal loan at Nedbank branch soshanguve crossing on the 2015 july 06 consultant said aft checking my papers I qualify for 88 000 next day 2015 july 07 I tried to call sms the branch and consultant to decrease that loan to R50 000 because that R88 000 is huge money I can't pay back the loan please decrease that loan reference no: ***8 i was supriced when I get sms of approval when I ask the why there were not responding to my call she said they were busy now I'm in hell they approved R88 000 n I can't take it because I can't manage it back I've tried nedbank personal loan to help and even nedbank complaint department they said they can't help me so please anyone to help me about any advice I'm in trouble to payback that loan