Complaint against the Call Center manager

I called customer care on the 20th of September 2017 @ exactly 18:00, I spoke to Vuyiswa Nthabeni who could not assist me because the system was offline. I relayed my frustrations because it seems the system is always offline when I call Vodacom so i requested to speak to the manager who said her name was Kelly Cornwall (pardon the spelling), who ensured me that they will contact me as soon as the system was up and running so they can assist me, she took down my details and I must say she was quite rude as when i explained my query to her she made it seem like what happened to me was not possible and that i was lying. Anyway, I waited.... And waited... And waited..No feedback, no response, nothing from this so called manager. I deem that as unprofessional to promise to contact a client and not do so. My query could have been solved quicker, they should have kept their empty promises and told me to call back. I know I am probably writing this complaint in vain because Vodacom does not care anyway. But an apology from this Kelly manager should surface for just uttering a few words just to get a client off the call and not keeping to their promise. She couldn't even give me an email address where i can send my complaint hence i am now using Hello Peter. I do not have a reference number for the case because the system was offline but I believe there is a call recording as i have provided the date and time.