Repeat Error C* message despite clearing and tightening bobbin bin

Sew ... I bought a sewing machine (Brilliance) less than a year ago in Lidl in the UK (still have the receipt). I have used it twice and now and error message keeps appearing C*. The booklet does not help. Ive checked trouble shooting websites but nothing works. Thread keeps gathering in clumps. I have been sewing for ** years plus, this is my first new machine and all it does is breakdown. I want my money back.

Error just kept occurring despite following the trouble shooting, collecting material and ruining the tunic.

I bought the machine less than a year ago and have used it twice before the error message - I was simply sewing straight lines, not even used the patterns yet! So, I want my money back so I can buy a new machine.

I have been sewing for over ** years and have never come across this repeated error again and again. I showed it to my mum who has been a professional seamstress for over ** years and owns a large industrial machine and she could not fix it either.

I looked on Google for the C* code, there are mixed opinions on what this might be including potentially a computer error within the machine. I tried to locate a repair shop near me but the nearest is miles away and does not specialise in Singer.