How do I have the rules enforced at my condo? The board isn't doing their job, and I get no response from our management company.

The rules incorporated into our condo documents states that all commercial vehicles any kind or description,campers boats and boat trailers,and trailers, are specifically prohibited from any portion of the condominium property. There is an air conditioning company van with a ladder on top parking hereby an owner. I immediately complained to the president of our board and was told that he could park here. I told them he could not, and have continually e-mailed the management company with no remedy. They said they are contacting the board and the owner, but this has been going on and I see nothing happening. What can be done? I have been here 17-18 years and they are violating my rights to have all the rule enforced. They can not pick and choose what they wish to enforce. My next door neighbor had a company truck with commercial tags and was forced to park in the street.