This is a private parking issue.
The use of the word Haringey and its format are deceitful, this has nothing to do with Haringey Council (whose corporate logo they are mimicking) as an Enforcement Authority acting under the authority of the Traffic Management Act and regulations.
It also doesn't come under the umbrella of the Protection of Freedoms Act 2012 whereby a registered keeper may be held liable for the 'sins' of a driver because in order to avail themselves of this right a creditor must satisfy conditions and in this case they've fallen at the first hurdle because they,Wing Security Limited, are not an Approved Operator of an Accredited Trade Association.
Do not on any account contact them.
Do not try to explain anything to them.
Come back here if the registered keeper receives correspondence on this matter.