It might be difficult for the expert to state categorically days or weeks later that a fault had been present at a particular time. Consider withholding any further money until the problem has been sorted out, but check the small print of any contract you have signed. It may be desirable to seek further advice. If you are still dissatisfied after complaining to the trader there may be a trade association or other body you can turn to for help, or you can get advice from a consumer adviser at a Citizens Advice Bureau or Trading Standards Department. You can also seek the advice of a solicitor.
Some solicitors work in law centres or advice agencies which offer free advice.
Many solicitors in private practice offer a low-cost initial interview. Your local Citizens Advice Bureau can help find a solicitor who participates in the scheme. There is also the option of going to court. They will often advise on everyday shopping problems. Some trading standards departments run consumer advice centres near main shopping areas.