Pathetic service

I recently did an upgrade to a Huawei Nova8i online for R250 pm subscription plus an accessories voucher of R250,the deal was on promotion After a few days I did a follow up by calling Vodacom. Only to be told that the Vodacom system was outdated and the very same deal was now R329 pm subscription plus a R250 accessories voucher. At this point the handset was on back order for about a week. Upon receiving the handset, I received a text message saying that the subscription would be R349 pm and the R250 voucher was missing. I called Vodacom and consultants that I spoke to on numerous occasions made mention that they don't issues vouchers and they would escalate my query and with the said R349 subscription which was not initial agreement. I made about 7 calls to enquire about this issue and on all those occasions I was promised that I would get feedback either on that very same day or within a period of 24 hours but to no avail. I remember I spoke to Rendani twice on different occasions, who was very sympathetic but helpless to the cause. I've been with Vodacom since 2002 and for the past 5 years or so their service levels have decreased significantly and they seem to have either lazy or *********** personnel in strategic positions because a problem like this certainly cannot be ignored.