Material Received but Invoice not yet Recieved

aamir ahmed (Accountant)     17 February 2021

Dear Sir 

I entered into a contract with a intra state party. i had to pay a security deposit which is done on 27.01.2021. I received the material on 11.02.2021. but still i have not received the Invoices. 

Please let me know what is the period within which supplier needs to furnish the invoices and also in which form "By post/mail/whatsapp".

Thanks & Regards