Banks shortpaid us- NOT doing their job!!

I have made a minimum of 15 very legthly calls to try and sort this out to no avail. Some of the ref numbers: *** + *** + *** + ***. I sent all docs through to the home loans dept and called to confirm all docs regarding our first progress payment was received on the 31.07.15, which they confirmed, They advised an assessor will be in contact within 24 - 48 working hours to make an appointment to come and assess the progress. To which I have yet to receive a call or any contact. The only communication has been made from my side. I was told on Friday a full 5 working days later that a desk top assessment was done and they believe we are at 17 % complete. When we are in actual fact 35 - 40 % complete. So we requested a R 250 000 progress payment, NO ONE came out and they decided from their desk to pay us R 103 000.00. I have never in my life. We are up to our eye***** in 35 - 40 % debt regarding the building loan and we have 17 % of the money due to us to pay already overdue accounts and proceed with building. I asked that a physical assessment be done and they amend their decision and pay balance. I have still received no feedback regarding this. DISGUSTED