Requesting an invoice

On the 11th of November I sent an email to customer service and Dion Wired Tygervalley requesting an invoice of goods that I purchased. My handbag was ****** and in my handbag was the invoice that I am now requesting. I gave customer service all the needed info( date, amount,goods purchased and the card used). Tygervalley came back to me and said as the invoice is older than 3 months they must get it from Head Office and they will send it to me as soon as they receive it. After couple of days I followed up and they said they have not received it. After another couple of days I followed up again with no response. Customer Service's reply was that they will follow up with management. After more than a month I sent Dion Wired a message on Facebook. The reply was that they will follow up with management asap. This is more than a week ago and no response from anyone. I need to replace my cellphone screen and only have time until Feb for a free replacement but I need the invoice. I have now been struggling to get an invoice for almost two months. I have all the emails as references.