We did a restoration clean for a client who had tried to clean the carpets themselves with a cheap hire machine.
This is a good example of why you shouldn’t try to clean your own carpets with a machine hired from Bunnings or a supermarket etc. Unless you are really lucky, they will usually leave worse problems than you started with. A professional with all the right equipment, and preferably one who belongs to a reputable association (Carpet Cleaners Association Of Western Australia) for example, may seem more expensive, but in the long run will cost you less than having a go yourself with inferior equipment.
However, if you have already made this mistake, depending on exactly what has been done, we can usually make your floors look like you wanted them to again.
Fixing these issues is not cheap or quick, but will be much better than replacing the carpet in most cases.