You are encouraged, in the first instance, to either write or speak to the person who is dealing with your matter, or your relationship/client partner (whose details will be found in your engagement letter). Full details of Womble Bond Dickinson's (UK) LLP's complaints procedure and email contact can be found here.
If your complaint relates to a contract entered into online or by other electronic means, you may be able to submit your complaint to a certified alternative dispute resolution (often referred to as ADR) provider in the UK via the EU "ODR platform". The ODR platform, which is available for cross-border and domestic disputes, is an interactive website offering a single point of entry to consumers and traders seeking to resolve disputes relating to online contracts for goods or services. The website address for the ODR platform is: http://ec.europa.eu/odr.