SA paving - grass growing through and house damage

SA paving just finished at job at my home. I paid them R100 000 to pave my driveway. Markus was handling the job. The job has been completed for 5 days now and already there is grass growing through the new paving. They also cut the paving right next to the house and stained the wall. They haven't come back to fix that yet. They begged me to pay them in full in December before completing the job saying that they wouldn't be pod before Christmas. Now I have paid them in full and the outside of my house looks terrible. They aren't too forthcoming in fixing the issue and the JHB office don't even answer their phone. I wouldn't recommend them.