Absolutely no follow up or feedback to customers

I received numerous emails offering a promotion whereby I can pick 10 products and get 10% off with each purchase. I bought 2 of the products and did not receive the discount. I have emailed customer care so many times to ask for feedback on my query.. They do not respond and have absolutely no follow up to customer queries. I followed up myself (twice via the contact form in their website and twice via their social media on Facebook, but they have still not contacted me or resolved the query which I originally opened on 08/03. <br> Very disappointing lack of urgency or feedback from customer query! <br>