Hi almazlfc,
I understand you're finding that a deleted app reappears after some time, and I'm glad to see if I can help.
Are you able to permanently delete the app from Settings > General > iPhone Storage? You can typically tap an app there and delete it.
If not, there may be other possibilities to consider. Was it installed using a profile? If so, check out this resource: How to delete an app that has a configuration profile on your iPhone, iPad, or iPod touch
Also, which exact iOS version are you using under Settings > General > About?
I hope this helps you. Cheers.