Do family members have the right to know the information and telephone number of the detained police?

My brother is now in Wuhu detention center, suspected of criminal responsibility. I called the relevant police station to ask where my brother was being held. They said I had no right to know. Now find a lawyer to see my brother, but the lawyer can't find my brother. What should I do? There are only two detention centers in Wuhu and there is no news of my brother.