HelloTalk - Charged for Yearly Subscription after purchasing Lifetime Subscription.

Greetings,

I recently did a trial for the VIP feature of the app HelloTalk, which included a post-trial yearly membership. But after the trial, since I was satisfied, I bought the Lifetime subscription.

However, the yearly subscription was still active, so even though I already had a Lifetime VIP account, they still charged me the post-trial yearly fee of £24.99, and then converted my VIP Membership status from "Lifetime VIP" to "Yearly VIP".

Therefore I want to either request a full refund of my "Lifetime VIP" payment made with this account, which cost me £69.99, and was made with the same Apple ID, or get a refund for my yearly payment and get my "Lifetime VIP" back. Can you guys recommend me the best way to handle this problem?

Regards,

Noel