Standard i want my house back

A bond was taken out with Standard Bank in 2003 (proof of payment available) for your perusal. My complainit as it stands is that I have been treated unfairly by Standard Bank and in the process of losing my home. After I got retrenched and I communicated with bank to make arrangements the didnt give the opportunity to explore other options due to my financial status at the time .The bank had already made up their mind that they wanted a settlement of the full balance.The communication from standard bank was never clear that they want me to stop paying installments and settle the full oustanding balance. Between 2003 and 2011 i was still paying my installments .2016 we communicated with the bank to pay the arears outstanding and the they didnt want to accept that arrangement ,I have always communicated and let standard bank know of my finances.However their goal is just to increase the Homeloan debt and take my home and auction it .Now they have sold my house at Auction price .I owe Standard bank R500000 and my Home is worth R ********** . Standard bank has done this because they said they received mandate from the court .I asked the bank for the credit certificate and they couldnt give me or show me one .Kindly help me fight the unfair practices that they commited in my case ,and the money that they ****** me.I want to pay standard want I owe them and get my home back or Can the house be reauctioned at a reserved priced so that i can get my money back i invested in my house. Or can i buy my house back at the money i owed them.