Unsatisfied with Results, No Refinement Trays Offered by Doctor? (photo)

Paid £3,950 (~$6,300) for 12 trays Invisalign Lite in London. Feeling overcharged. I put ib the last tray in December. I am not happy with my upper incisors. My dentist refuses to order refinement trays. She prefers adding additional attachments to my teeth to further tweak its position (whilst still using the last, 12th tray for weeks now which is also interesting as it should be used for 2 weeks only). What shall I do? Find another practice? See photos of my upper incisors attached.