Hi LucyLu
Welcome to the forum.
You might want to have a look at the following FAQ which explains where everything is;
www.benefitsandwork.co.uk/guides-for-claimants/faq/forum You need to contact PIP helpline; 0800 121 4433 and report a change in circumstances.
They may ask what triggered the change and when, was it due to an operation, change in medication or receiving extra support, there may be an overpayment so be careful in what you say.
Gary