No response to complaint

I received a text from FNB amongst a lot of others. This was dated on the 15/07/2019 which said "FNB :-) here's a good reason to switch your salary! Get a free R250 Airtime voucher when you deposit your salary of R2000 or more into your FNB Easy Cheque account. Offer ends 30/09/2019..." I sent an email to inquire about this and got no response in over two weeks. I then called them on 17/09/2019 and i spoke to a rude agent named Swazi who was no help and just wanted to fob me off and purposely transfer me to the wrong department. I then requested for a manager who first refused to speak to me and eventually when they came to the phone Kronel the manager immediately started going on and on and on not giving me a chance to talk. so I llowed her to speak and finish then she wanted to end the called then I pushed for her to listen to me. My main issue or my simple enquiry I had was not resolved and was told I ould receive a call on Wednesday 21/08/2019 but I have not heard anything from anyone at FNB. Im just disappointed at the level of service I as given by the agent and manger. I should not be treated differently just for inquiry about what was offered to me. if i don't for qualify for any reason this could have told to me.