Lack of reponse

I hired a car with Europcar in the UK at the beginning of 2015, and submitted a claim through the Europcar website to earn SAA Voyager miles on this hire episode after my return to South Africa. I received an email from [Email Removed] Partnership Claims) on 15th April, asking me for copy of the rental agreement/invoice. I rep**** quite late (12th May) with this, as requested, querying why the details could not be picked up from their system. I then received another email on 30th June asking for the same thing, which I again supp****, and have received no response since then. I am not sure why I am compelled to supply the invoice/rental agreement, and why I have to do so repeatedly. This undermines the SAA's Voyager programme, as well as Europcar's reputation.