年度大會改為線上
Dear Heli Gaming,
致核粒遊戲：
I am writing to ask for a refund for the ticket I bought from you on January 15.
特致此函請求本人於1月15日購買的門票退款。
Being a fan of yours, I have been looking forward to this year’s annual convention.
作為一名粉絲，我對於今年的年度大會期待已久，
look forward to=期待…
But since it will be held online, I would rather choose to join the event next time when it is held physically.
但既然現在改為線上舉辦，我想往後有機會再參與實體活動。
physically(adv.)以實體的方式
However, during the refund procedure, I have come up against an issue which prevents me from submitting my request.
不過，我在申請退款時遇到了問題，使我無法提交申請。
procedure(n.)程序come up against=遇到prevent sb. from=讓某人無法做某事submit(v.)提交
I believe I am entitled to a complete refund as the request has been made before March 20, which is within the due date specified in your refund policy.
我相信我有權獲得全額退款，因為申請是在3月20日以前提交的，尚在貴司退款條例規定的期限內。
be entitled to=享有…權利due(adj.)預計的;預期的
It would be grateful if you could deal with this problem as soon as possible.
若您能儘快處理此事，本人將感激不盡。
deal with=處理
By the way, I made the payment via PayWays, so please deposit the refund directly into my account.
順帶一提，我是透過PayWays線上轉帳平台付款的，請您直接將退款匯至我的帳戶。
payment(n.)款項deposit(n.)押金(v.)存放;匯入
My account number is 4456-3322-010, under the name Roderick Cook.
帳號為：4456-3322-010，姓名是羅德瑞克·庫克。
Thank you for your help with this matter.
感謝您協助處理此事。
Regards,
致上問候
Roderick Cook
羅德瑞克·庫克