Bad service

I have not received my refund from june, i was interested in a july vacation so i started paying in May i sent them via whatsapp my slips, on 1 June they told me they cancelled my trip as they had not received my full payment which was shown on an incorrect invoice they sent me, i told them about the miscalculations on an invoice and how i did not see that i was suppose to pay all the fees in one month... the admin is very rude and they ignored my concerns until they blockef me without a refund, tried emailing them they still ignored my emails