Thieves found but no recovery

Sir, i belong to a middle class family and currently i am going through lots of stress and frustration. As on 8th june 2019 burglary took place in my residence when i along with my mom went out of station but my father was in town only. He does home tuition so during day time he went to teacg tution to the student and meanwhile few thieves entered my house and stolen all the precious ornaments of mom which worth around 3 lakhs and also cash of around 40000 papa on coming from his work he was shocked to see such a condition of room and almirah he immediately went to file an FIR in nearby police station. Undoubtebly in the initial days police were very agile and they were very cooperative and as a result of this thieves were caught as they committed many incidents of burglary in my town within that time span of 2 months. Thieves comprised of few females who used to look after the house from outside and the main culprit the male used to go inside the house. So round about 7 to 9 thieves were caught by police. The real and dirty face of police started coming clear and spick after that when police utterly refused to recover anything they always say that they have interrogated the thieves but thieves are not giving any positive reply and they cant even wallop and drub the thieves as they could even file an FIR against the beating of police to them. Sir now i feel indeed helpless and disappointed. I dont find any hope of getting my stolen things back therefore please help me to get it back. I will be very indebted for your help