No response from installation department

A call was logged on 29th December as my fibre connection went down. Vumatel only responded on 2nd January 2018 to inform me a re-installation needs to be done. The same day a call was logged and they promised me within 2 days I will receive a phonecall from Installation Department to schedule a date. I have received no call yet. I have contacted the call centre several time to follow up, where these agents then contacted the installation centre who promised to call me within an hour. Everday I follow up as I do not receive any calls. Installation centre seems to make empty promises even to their own collegues. It is not possible to call installation centre directly. Absolutely poor aftersale service!!