Complaint Review: Q clinic Harley street w1g6bg london Uk

Hi, I went to q clinic and post initial free consultation with Dr tapesh I signed up immediately paying a full amount of 1900 on the spot. At time of signing I was told that the cost breakup was 520 for initial examination including x-rays and impressions and cost of 1380 for the treatment. I was unsure about the kind of improvement I would see with invisalign as I have a significant overbite. I was told by the treatment coordinator that I could decide whether to proceed or not after the results from the impressions came back, at which point if I decide not to proceed, I would lose the 520, but would be refunded the remaining amount. This was a risk I was willing to take. I went for the initial examination at which I was told that a past root canal I had, needing to be redone, and invisalign could only proceed once this root canal issue was fixed. I then decided that I did not want to proceed with invialign at all. When I then asked for a refund of the remaining amount, I was told that they could not rfund anything, I.e. I would lose the entire 1900. I am extremely shocked and don't know what to do . Please note that at this point I have not even had my impressions taken and only had one 30 minute appointment where the dentist ( not dr tapesh) conducted an examination and did a couple of x-rays. I am at loss as to what to do and wondering if anyone else has had a similar issue with q clinic and if there is any legal recourse I can take to get my hard earned money back. Q clinic are going back on their word. I had confirmed the point about what happenes if I decide not to proceed multiple times during the free consultation and was assured that I would be refunded the 1900 less the 520, and now they have gone back on their word !!! Please some one advice , I feel completely cheated by q clinic !