Worst service, harassment

I recently opened up an account with real people being assisted by a rep at DIY Kagiso. I had the worst service, starting from the rep at the DIY kagiso store, the rep is happened to be the store owner as well. Wrong amount was requested, the rep jumped processes,to which the store owner admitted to making a mistake later. I had to wait over 2weeks for payment. Even went to the real people head offices in Rosebank to demand assistance after the person assisting me at real people went MIA. When I got their offices I was asked to go sort everything out myself at the store even after I had explained the kind I received from the store owner. Long story short, I have worked with the company before on 2 projects. I have had 2 stores harass me. I am at the point where I am questioning their respect for the customers that have to deal with the stores they work with. Are there any measures do they have in monitoring if processes are followed and when not, what steps are taken in dealing with the store. For me to get money out of the store owner I had to go to the store countless times leading to me keeping the employees way past closing time at DIY Kagiso because the owner wouldnt come to the store after he had asked me to wait for him for an hour. Im not one to complain but this is the last time.