VUSE and TWISP - Hard to do business with!

On the 30th May, I made a purchase online from Vuse. Shipping was meant to happen within 1-3 working days. On day 5, I e-mailed them to ask where my delivery was. I was then notified that there was an issue with my order being processed, and that it had to be cancelled. I was then asked to please e-mail them sensitive details including my bank account details which I declined to do. Since then, despite numerous mails from me to request a refund for my order, VUSE have failed to re-imburse me for my order. I have corresponded with Sebastian from the refunds team on many occasions without even the slightest confidence that this matter will be resolved.