SRL Diagnostics — charges of vitamin d

Sir,
I had carried out vitamin d test on 20th may 2020 at gurmeet imaging, vashi navi mumbai. The said lab had charged rs.3800/ for this test vide receipt no r/2020/05/29/0004 for patient suvarna wani.
I had enquired in another reputed lab charges of this test and got information that the charges of this test is rs.1500/.. Only
Sir,
1) pl let me know whether these charges are as per your company rate list.
2) if the charges are taken in excess please refund me the excess amount at the earliest.
3) if the charged rate is correct then why it is difference.
I am requesting you to enquire and send reply or amont at the earliest.
... Mrs. Suvarna wani