Eastvaal Ford Witbank poor after sales service.

I bought a vehicle at Eastvaal Ford Witbank on 19 December 2018 and on my way home the vehicle's tyre monitoring system alarm came on. I stopped and checked but no problem was visible. I contacted Dot, the sales lady and informed her about it. she said i should just reset the system and see if it prevails. the alarm kept coming back though. When i took the vehicle for service the next month (at the Secunda branch), they found that the original rims was removed and the sensors was never replaced. it was arranged that they would order a sensor to see whether it would fit in the new rims. If not, they would replace the rims and fit the sensors. After contacting Dot several times to get updated on the progress, she would say that she will come back to me with an update but rarely did. To date i have seen no progress with the arrangement. All the while i am driving the car that is missing a crucial safety feature.