The "customer" could be charged under the Computer Misuse Act 1990,
Section 3: Unauthorised modification of computer material.
(1)A person is guilty of an offence if—
(a)he does any act which causes an unauthorised modification of the contents of any computer; and
(b)at the time when he does the act he has the requisite intent and the requisite knowledge.
(2)For the purposes of subsection (1)(b) above the requisite intent is an intent to cause a modification of the contents of any computer and by so doing—
(a)to impair the operation of any computer;
(b)to prevent or hinder access to any program or data held in any computer; or
(c)to impair the operation of any such program or the reliability of any such data.
(3)The intent need not be directed at—
(a)any particular computer;
(b)any particular program or data or a program or data of any particular kind; or
(c)any particular modification or a modification of any particular kind.
All that is required is a police investigation, and if enough evidence is found to support a prosecution, charges to be brought. That's when the courts would become involved.
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