What is going on ?? service is really down grading

i have app**** for a smart housing loan with FNB 2 months ago,i received a call saying the loan was approved.until this day every day i keep getting the same phone call that my proof of address is incorrect i have been twice to a branch to verify my address.the consultants @ the bank says everything is fine but the agent assist me keeps saying its incorrect .the owner i'm buying the placed from as given me 14 days for the money to paid always i will breaching my contact.this is now frustrating .i am a very irate customer who is receiving bad service.cause the people @ the bank saying one thing and the agent tells me something i ask the same question is there anything else you'll need,the response is everything is sorted then you get a phone call saying i need to provide proof of address.leaving my job and rushing to a bank is not on as i have lawyers waiting for an answer.