RTO India — Not Received RC Book

Address: Tharappel House Vechoochira P.O Pathanamthitta Kerala - 686511

Hi Team,
I purchased a new two wheeler in Feb 2021, till now I haven't received my RC Book.In parivahan app I could see my rc book but haven't received it. Whenever I call the rto to enquire they do not answer the call or they ask to check with dealer it has been 4 months what kind of service is this. Whom should I contact for a solution