********** service and utter refusal to help from Vodacom

I have a work phone for which I am paying monthly and then claiming back. Vodacom to date refuses to give me invoices for each month, only statements. Every branch I visit has a different story, which means according to my company policy I cant claim back without an invoice, they dont work off the statement. I do not understand how any business can work without invoices and why it has been MONTHS of begging and pleading to no avail. ********** service!!