False Promises by Standard Bank

Two years ago I received a credit card offer from Standard Bank, which I accepted. At the time they offered me the credit, they made a commitment that they would beat the interest rate of my credit facility with my bank at the time, provided that I could show that the interest rate I had, was lower than the one they were offering me. For two years I have been attempting for Standard Bank to honour their promise that they made to me. Fast forward to two years (including branch visits, calling their credit card division & emailing the proof that I have an institution that’s offering me lower interest than Standard Bank), I spoke to a consultant that told me that the adjustment to the interest rate that I was offered, I will not be getting it. Was what said to me a lie by a representative of Standard Bank in persuit of a commission & to offer me a credit card based on a lie? Is this how a financial institution & credit provider conducts itself to get clients to sign up for their services?

What I can say Standard Bank, I have wasted a lot of effort in perusing the adjustment in the interest rate that I was promised & this is making me really consider whether I would believe any offers from Standard Bank in the future & to whether continue to use their services.