Highly Bad Customer Service

Today(08/05/2015) I called and bought a pizza(Triple Decker) at Debonairs in Randburg CBD to be enjoyed for lunch with my two colleagues . To my dismay, the bottom case had no filling at all . I called at 12H40 and spoke to a Manager named Patience Tonganai who when told about the matter had the audacity to say to me because I had a bite on a slice she will not exchange it(how would I have noticed without having a bite - maybe I should have felt by holding a box) . She then said she will call back in 10 minutes and up until now am still waiting . I called them now and asked to speak to her , a lady who answered said she is busy will call when she is available . <br> What kind of a service is this , to be made to feel worthless , disrespected and undermined as a customer whereas I spent my hard earned money to support their establishment . <br> I am very disappointed that am taken for granted .