I’m not sure if the business culture is different (I read Bank of Spain, so making a guess), but in the US I would not tolerate a perfunctory answer to a “why” question. I have learned the hard way that people will treat me as badly as I let them.
There are rules; I couldn’t just fire a lawyer if I felt like it, but he’s not acting in your interest. If that’s not an ethics violation, it should be (in the mind of the all-knowing Jack, lol). There’s probably fine print in the fee agreement that specifies what constitutes when you may terminate the agreement, and what you owe if you do so.
Of course, as you said you would then have to find a new lawyer, which is also a hassle. Sometimes it’s better to stick with the devil you know, but it could be worth simply looking at other options.
I don’t know if this is practical for you, but the judge in your case is likely able to advise. I would guess that s/he has seen at least a few lawsuits, especially regarding real estate, that have the same dynamics. She even might have a form letter that details your options.
I’m willing to explain any idioms I used above, just LMK. I am sure my Spanish is far worse than your English, so please don’t be shy if the translation software doesn’t translate an idiom. I also live near Mexico, meaning I have learned Spanish with a Mexican accent…. Which sources tell me is looked down upon in Barcelona at least.

Like every country there are different regions so I don’t think it would be the same everywhere.