Unreadable Vodacom Invoices

I have been a client of vodacom for nearly 2 years. For as long as I can remember, I have been receiving my invoices in *.efa format. I have phoned them NUMEROUS times saying that even with the decryption software. the invoice is unreadable. I have logged queries, I have captured helloPeter complaints... to no avail. Everytime I am either being given the instruction to install the decryption software, spoken to the support technicians, and then I am told to send an email to [Email Removed] and request that my invoices be sent as pdfs. Still no feedback or correction of the problem. I get reference numbers (like 001C8aBBMF23NDXK) which means nothing if they never get back to you. For the duration of my contract I have never been able to view a SINGLE INVOICE. The service is disgusting and shocking !!!!!