ERECTION OF CARPORT STRUCTURE

I approached this firm to erect a double carport at my premises. Out of a total of 7 quotes they were the beter and more realistical quote. Although they could not meet their own target starting date they arrived the following day and started with the job. The job was completed the same day. The members worked till 10:30 that night. At that time the outstanding 50% of the price was transferred by means of an internet payment. The next day I saw some deficiencies that I wanted them to attend to and rectify. After various unsucessfull calls and setting up a target date to make arrangements for them to meet me at a buyer/seller level, I had no response. Being a freelance photographer I took photos and would like to post them on the net to prewarn any other buyer not to make use of them. (Please inform me if there is a facility to post these photos). Which direction should I follow with this query of mine.