Dealing with difficult clients is an acquired taste and can only be learnt by experience. It is not wise to engage in argument with a difficult client. It is best to be firm and factual. Never mislead a client under any circumstances. Never lie about a matter.
Clients appreciate frankness and honesty from solicitors.
Some clients have language problems. These clients need to be dealt with patiently. If necessary, interpreters should be present. Sometimes a sense of humour can placate a difficult client. This depends on the solicitor.