Invoice needed urgently

Pick n Pay customer service department and the Online customer service department are really useless. I sent them an email last week Thursday and another one on Friday, till today I have not gotten any response back NOTHING. I purchased a Mecer laptop from them and have been asking for the receipt as I cannot locate it from my emails and I URGENTLY NEED TO RETURN THIS LAPTOP to Omni Repairs as it is faulty. I even gave them the date of purchase as well as the invoice number for ease of reference, but NO... they couldn't be bothered to assist me nor respond to my plea. I need the POP ASAP. Can someone please contact me or email me the POP