No Invoices

I have a contract with Vodacom.Since Feb 2015 they have failed to email me my invoices like they used to do and I am still using the same email address.Every month I have to phone to request an invoice and then they email me an invoice stating \copy invoice"at the top.I need an original invoice in order to claim from company.The only way that I can claim from the company now for the past three months is to go to vodacom canal walk to get the \""copy\"" invoices stamped by them.The vodacom shops cant stamp the invoices becuse it must be a certified/commissioned vodacom stamp.Every month I complain at the call center and request that the next months invoice me emailed to me and I've been told for the past three months that my query will be escalated to accounts but nothing has changed.What do I have to do to get my original invoices emailed to me like they used to do????Im being inconvenienced and Im also losing money coz of \""copy\"" invoices and bad service from vodacom!!!!!<br> <br> W Packery"""