GBIT for a > 5000 € transaction

I unfortunately overlooked that there is a limit for GBIT of 5000€ per transaction.
However I read that such a transaction could be changed by contacting the support. I did contact the support with this request (+ transaction details) more than a week ago via the chat function in the app but I didn’t get any response since.
Is the support currently so busy (vacation season?) or is such a GBIT just not possible or could somebody help me with this request here?
Thanks for your help.

If you contact the support, please add a minimum respond time of around 2 or 3 weeks.

I wait for an ticket around 8 weeks and contact the Twitter support after that I got help.