Online order ***-A - Only partially received

Buy stuff online. Pay for it. Get an email you wont be getting half your order. Say okay well send me the invoice for the payment I made for the order. Then refund me the money for half the order not delivered because of no stock. I get an invoice for the first half. The other portion I'm not getting an invoice for. I need this invoice as proof to the company that this is what Leroy charged. i'm only getting an invoice for half an order!!!!??? Now they just ignoring me. In the mean time my company think's i've ****** from them because I paid more than the invoice is that I got. I'm also waiting on the refund for the stock that never arrived. Seems like Leroy Merlin is also taking on the mindset that if you ignore it for long enough it will go away.