Unhappy with FNB Home Loans

I have been approved for a home loan in July 2018 and since then I have been waiting for FNB to finalise the process and give the proceed so that the loan can be registered. They have a very slow response rate and have requested the same documents on numerous occasions. They asked for my proof of residence and I sent it, a week later they asked for the proof of residence of the person who wrote my proof of residence (the agent from whom I was renting), They later asked for the agent's ID as well. Another week later they wanted my lease agreement. There are many other examples of documents that they keep requesting. I now have to pay occupational rent on the house where I could have been paying off the home loan. I am very unhappy about the service and how long this has been taking