UTR Wrong Name / Wrong name on refund cheque

Hi, I have noticed that my name in my self assessment refund account has a wrong initial for my middle name, unfortunately this has also been processed onto a refund cheque recently received. Due to this my bank will not process the cheque, I have called the number on the letter however the helpline is now closed until 4th September? This is the first time I have had to complete a self assessment due to expenses going over the ceiling amount. I have tried to find a re-issue cheque / update info online however I’m getting nowhere and ultimately getting quite stressed about it all. Any help would be appreciated prior to 4th September. Thanks,

Hi RichieB,
If you click 'Ask HMRC Online' and state that you wish to speak to an adviser, you will be put into the queue for webchat and we can look into getting this corrected and requesting a replacement.
Self Assessment: general enquiries
Thank you.