Having Lender issues

[Cristobal Fernandez]

Hi there! My wife and I are new to investing and have secured an agent and a property (fingers crossed), we are currently hung up on the pre-approval letter. Since giving all requested documents, I have not heard from the lender.  I have tried emailing on a number of occasions and just flat out no response, it has been two weeks.  I'm seeking advice on what are the next steps I should take...should I move forward with another lender or keep trying with the current lender?  Is this a normal amount of time to wait?