RTO India — C Book issuing

Address:

Kovvur, West godavari District, Andhra Pradesh, India 534350

I've bought a car with registration number AP39ER9644 in June 2020. Even though it's almost 6 months and counting, I did not receive my C-BOOK. When I tried visiting the Unit Office here they told me that it will take time. How much time required to issue a C book for which I've paid registration charges. I immediately need an answer from the RTO.