Barloworld GM Isuzu, Poor Service

I have purchased a brand new Isuzu DC on 19 December 2014 from Barloworld GM. On the very same day I noticed a spot of rust on the paintwork at the back of the bakkie on the outside as well as a bubble on the paintwork at the bottom of the right front door. The first thing the following morning I took the vehicle back and personally brought the damage to the attention of the Sales Manager. The Sales Manager immediately acknowledged the damage as something that originates from the factory. He then took photos of the damage and promised me to take care of the damage within a week. I did not hear anything from the dealership again and when making a follow up in the second week of January 2015, I was informed that the Sales Manager has resigned. I then spoke to the Dealer Principle who then promised me that he will take care of the problem within a day or 2. It is now the 31st of January 2015 and still no word from the dealership or the Dealer Principle. I will really appreciate it if Barloworld Motor Retail will assist me in solving this issue.