Disgusting Service by Call Center

I just had the worst interaction with a call center agent Simphiwe , I called regarding amounts being charged to my account I requested a detailed break down firstly when answering Simphiwe was chewing and paused I had to greet her and make sure she wasn't going to hang up as this was my 3rd call being dropped . She then proceeded to talk over me and sigh with irritation. I am absolutely disgusted and horrified with this service even more shocked with exorbitant changes that cannot be explained by the staff at Edgars /RCS . Simphiwe then put me on hold for 5 minutes in which I hung up this was clearly her intention not to assist me . I want this matter escalated and a manager to contact me regarding this issue .