Lies and disappointment

After numerous calls and going back an forth there seems to be no conclusion. I upgraded my vodacom contract last month and I was promised a discount for not cancelling and also a R1000 voucher.I have just received my statement and no discount.I called in to dispute the amounts and to query my R1000 voucher which have not received almost a month later.Your agents actually had no response and told me to log a complaint with Hellplopeter. This a *****.How can you lie to retain clients