C***** failing to provide feedback on Competition entry concern

C***** is currently running a competition where customers should buy various Tropika products and enter via a USD number. The number is suppose to generate a SMS to upload the till slip. Although the T&c’s state that C***** doesn’t take any responsibility for technical issues, I have alerted C***** of the concern on their complaints email address, Facebook, Instagram and Twitter. To no avail. No one even attempts to reply. There are numerous customers complaining about the same issue, in other words is it not a problem related to only me. In the meantime people are buying the products to enter a competition of which C***** is clearly ignoring concerns of and benefiting from. The USD call obviously also is done at a charge. I am now escalating this to HP in an attempt to perhaps get some sort of feedback. Is C***** ignoring the issue on purpose?