Cannot activate VDSL account

I cannot get VDSL at home even though a technician installed the service two days ago. I was meant to activate the line by calling 10120, but cannot get through to the number. I have made numerous calls to this number from my cell number when at home, and from my office telephone number. This morning I was on hold for about 45 minutes after which I put the phone down. This is not acceptable service. I need someone to call me to get my internet up and running.