DELAY AND NOT GIVING VAT INVOICE

I had ordered wooden sofa on 17/1/2015 with an advance payment. The delivery date committed was first week of Feb 15. There was no advise from the vendor. I had to contact several persons of the vendor. Every time, I call they give one delivery date and the same does not materialise. After calls and follow, the vendor delivered sofa on 15/3/15 and I paid the balance amount by cash. Vendor is required to provide VAT invoice and had collected VAT amount also from me. Inspite of follow up, the vendor is not giving VAT invoice. Pls advise on where I can file case for delay/ not giving invoice.