Horrible customer service

I visited kfc Chatsworth, and on my visit I had a very bad interaction with the management of the store as well as the cashier over a pricing error due to to boards outside the drive thru not being update. On my visit the cashier as well as the manager was extremely rude and raised their voices as if I was the reason for the error..no solution was provided as the manager ask me what she should do ..as a cusomter how on earth am i suppose to know the protocol that needs to be followed in such an event ...I had complained to kfc and they called me and confirmed that the store would be in contact and the would also advise me further..it's been 2 weeks since then and still no response..since a disappointment that they value their customers so little...