Firstly, you have a Doblo. Not the most popular vehicle in the Fiat fleet, so therefore not the most popular here either. That reduces the number of people who may be able to help.
Most Doblos are likely to be vans, not cared about by their owners. The car version tends to be owned by people who see them as practical transport, so are less likely to be enthusiastic about them. With all this, the number of people able to help is limited.
Secondly, few of your posts are unanswered. Most have been answered on the same day they were posted. A couple have remained unanswered, and they are where you've posted a question on the end of a thread. You might get a better response to those using the PM (Private Message) facility.
Your most recent post that is unanswered relates to the rear anti-roll bar. Yet an earlier post to which you contributed contains a good guide as to how one owner tackled his. So there's your answer. That could be why no replies, as all the Doblo owners have already seen the earlier post. This may also apply to the rear door lock question, where either the broken bar is available from your Fiat dealer, or you may have to make one from a suitable steel rod.
Many contributors on here only view the threads applicable to their car. The rest of us can only answer questions where we have knowledge, or can make a good guess. So please, if you want to get the best from this Forum, you may need to work a little harder. You may have to become the Forum expert on Doblo!
Lastly, are you in the UK? A couple of your posts suggest you may be in Greece, in which case you might like to update your profile to reflect this as it currently shows the GB flag.
Keep persevering, we will help where we can.