problems with a CVT

Hello friends, I hope someone has an information about a problem with a 2008 patriot brings a CVT and already lowers it 5 times and changes my faults but the main problem is that it loses the application on a low and zumba at high speeds once it warms thanks.

I have not seen reference for repair of CVT transmissions what they have told me is that there are no spare parts or repair, that the transmission must be changed. According to the theory they work with bands and pulleys, I do not know if you have changed them,
or
or if you are putting the right oil because it does not use any oil. If they mixed normal oil with what it is for CVT it is possible to slide.