Does bank have the authority to put a guarantor property for auction

My uncle has taken a limit for his business and my father's is guarantor for that limit and my father's house is put as a guarantee for the same..the limit was of 21 lakh @12% ..uncle paid some installments in starting then he had a big loss in hia bussiness ..after that my father paid some amount but because of bad financial conditions now my father is also not able to repay it ..my father needs some time to repay it as he can repay it..my father and uncle had paid 20 lakh as a interest and principle amount..but still 26 lakh is arrear ..and now bank is going for auction and has files a case for the same to the director commissioner of district.. please give some suggestions in this regard so that auction can be stopped and we can have a time to repay limit