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Seems a bit mad.
I don’t quite understand what an architect is supposed to have done for you here but you feel they haven’t delivered.
I’d be interested in what the statement of work or terms of service say - if they provided them.
Id second the above - you need more quotes.
In the meantime try to quantify the gap between what was promised and what has been done. That might help understand if you are obligated to pay them now.
It's a relatively simple and small extension. We told him we had a budget of £110,000 inclusive of everything. It's hard to say exactly what the quote is because there's not a lot of clarity on the contractor's quote. But even with several large parts of the work definitely being omitted, and maybe others that we don't know about, it's already reached £165,000. Despite claiming to manage costs at the start he's never given us a budget estimate - I've had to cobble it together from various bits of baffling contractor emails and random bits of quotes from material suppliers.