A Bug in Excel Office 365 latest edition in the Header

Whilst preparing my office accounts Trying to type A&BC ACCOUNTS   The Header kept changing the layout and style into Jibberish Spent nearly an hour with the MS-Tech on Chat and he found the same problem on his computer We could not find a workaround and it has been reported to Office365. Just so save someone else trying to sort it out.  Apparently the header will not accept a & symbol