No Service on the agreed date

According to telkom they have contacted me but I have no missed calls on my phone. The date agreed upon was 11 december 2017 to install my fibre line at home. Called the call centre they told me the appointment was cancelled and the only date to install was 8 january 2018 becuase the service centre have closed for the holiday. How do you want to supply a sercice without any delivery? Very dissapointed think of canceling my contract with them.