RTO India — Registration certificate not received

Address: VPO JEOBALA DISTT TARNTARAN PUNJAB

Sir/mam
I buy a car from novelty Hyundai Pathankot on 29 dec 2020. I apply for registration on same day under RTO tarn taran and paid full road tax through agency. High security number plate fixed from agency on 12 jan 2021 as PB46AF3121. But registration certificate not received on till date after laps of 6 months. I drive my car with provisional R.C and police force me for chalan.
I suffer as guilty without breaking any rule.
Please give me justice and provide my car R.C Thanks for this