Appointment worry over nothing?

last week I reported a change in circumstances in saving catagory because I recieved a backdated payment for pip under 3k. I know it is disregarded for 12 months. I included backpayment in the total savings but on another page there was an option to declare benefits payments received for backdates which i declared. Before the backpayment I was just around 7k total. it was 8k a year ago and they have been deducting on that basis. i have not updated for a year as it never increased just slowly went down 1k over the year. Now I have been asked to come to jobcentre for an 20min appointment but only states it is because of change in capital. They have not asked for statements. I have asked in journal for a telephone appointment and willing to send anything they need. Can they insist i attend? - I am very anxious about this and cannot get social support in time or anyone to go with me.

I am also worried about it triggereing a wca as I have been awarded pip and see it as my health has worsen. Will I need to send fit notes if they want a new wca? or just fill a new form and wait? I am in uc support group equivalent. im I worrying too much? Advise appreciated