Poor attitude, shocking after sale services!

I got referred to this contractor via the call center for Independent Service Providers to do maintenance and repairs at my home. The contractor made promises of a 6 month workmanship guarantee when he took the job, he did work on my chimney and roof, and two months later when I asked him to come and fix the leak on the roof down my chimney, there were constant excuses. I need to wait for him to get another contract in my area for him to come and fix his handwork. It's now 3 weeks later and despite several contacts to get him to come fix his mess, there are empty promises and no sign of this contractor. I spent around 20k with this contractor and had other issues but this is shocking, to say the least. Next stop is to contact the Call center to report the type of contractors they have on their preferred list.