Urgent help

I think I have made a huge mistake with one of my bets because I didnt know what I was doing.

Where it says bid on the green sometimes, I went and typed in the original amount that was previously showing there.

I realised as I did it - that suddenly I was placing a liability for £448. I was trying to do an acca for three teams. I realised too late I have done a stupid thing.

Can anyone help me? I have called Smarkets but their lines are closed and I cant find the chat function to speak to anyone


Also if anyone could send me through to live chat I would really appreciate it, I am worried I could potentially lose hundreds of pounds