Medlife — invoice of bills

I have been a regular customer of medlife but the non co-operation about producing timely bills of invoices of the medicines purchased has irked me to a great extent.
Upon telling innumerable times to produce the bills with the doctor names which i had provided them during booking the medicines they aren't able to do this simple activity. They print their doctor names who had called me regarding the medicines.
Secondly upon calling them 4 times and reconfirming the doctor names i still await the invoices of the medicines purchased.