Terrible customer service - Someone needs to call me.

Bought a gift Subscription for a year for Britbox (Not cheap at R1000) and now I cant load a profile or link the gift subscription to it. Tried on a couple different email addresses, with and without the gift code, with different credit cards to no avail. I keep getting "Sorry, something appears to have gone wrong. Please try again". Left multiple messages on their help line (which there is no telephone number for) only to get automated responses and then when someone does email promising to call me and help sort it out, I wait and no call. Then the next day Ive got to do it all again which prompts me to a completely new help centre staff member. Had the voucher for nearly a month and still cant use it.