Poor service from Keller Williams Advanced

I am absolutely appalled by the service we received from Tania De Vries at Keller Williams. She does not answer her phone neither does she return calls to provide feedback. I went as far as getting her principals cell phone number and Lucinda was not helpful either, she promised to provide feedback to me and confirmed if she could call me on the same number but I did not receive a call from her and she too did not answer or return any of my calls thereafter. I will not buy or sell any property using Keller Williams Advanced in Roodepoort and will quite frankly stay away from any properties listed by Keller Williams advanced.