The more people involved the less responsibility each needs to shoulder and the more chance there is of the complainant being confused and giving up.
This ploy is used by many large organisations that wish to minimise the risk of accepting any responsibility for their actions which may mean 'paying out'.
Often the threat of legal action if they fail to comply with the law is sufficient to cause them to respond. In other cases involvement of the press resolves the situation as they will often use their lawyers on your behalf and take the 'story' as their payment. This latter is hated by organisations as it puts the spotlight firmly on the actions taken for non-compliance.