VODACOM FIBRE not installed at agreed date

I have ordered fibre installation from Vodacom on 13 May 2020. On 14 May they have confirmed my appointment for the installation on 22 May 2020 at 08:00. This morning I phoned the call centre to follow up as no one pitched at 08:00. The lady informed that the installation people can show up any time from 08:00 till 12:00. I indicated that this is not what was communicated to me and we had to put in leave for the day to be at home for the installation as we are essential workers. She said she would like to phone someone and get back to me. She did not. I followed up with another call to the call centre and the lady informed me that she cannot give me contact details of who to speak to - she can only follow up via an email but she cannot give me information on the service provider. At 13:00 I phoned again and the lady transferred me to the support line and I have been kept on the line for over half an hour with no assistance. We cannot take leave as and when it suits Vodacom. If they make an appointment they should stick to it.