Horrific Service. My vacuum cleaner has not been returned after 6 months

My Dyson Vacuum Cleaner broke in July last year.

I called the call center and they said they would collect the appliance for a fee and call me with a quote. I paid the fee. They did not call. I called them to ask about it and they said my job got 'lost'. They would send me the quote. This went on once a week for another month or so. (I called them each time) Eventually in October I received a quote to repair the vacuum. I paid it the same day and sent the proof of payment as requested.

As usual, Nothing happened. I have called and emailed repeatedly since October to ask when it will be repaired..? (I have already paid for this and i have no vacuum)

Each time they say it will be this week. I called today again. Apparently '"the parts have arrived this week" This has been repeated to me three times now when i enquire what is happening.

My emails to the manager and repairs department go unanswered.

I still have no vacuum cleaner!