Jorge ....
I understand why you want to keep on trying with the rose.
Sometimes, the best way to answer that question is to take the plant out of the container and look at the roots. If the plant is so root bound that it cannot grow the small feeder roots a rose needs to take up water and nutrients, you may be able to keep it alive, but I don't think the rose will be happy in the long run.
When I took my climber out of it's pot I found that the roots were so wound around the plant and the root mass of large roots was so big, the rose didn't have a chance of succeeding and I had it in a very large pot.
Good luck with your rose.
