Jeanne, you must make a complaint to the Police to ensure it's on official record.
Contact your provider and ask for copies of all your data, including that of authorisation documents.
It's a criminal offence under UK Govt legislation and who is to know what other offending the said person /people have committed.
Most data, especially through electronic devices, is able to be traced and pinpointed to the exact time and location it was done, including through the so called VPN/ or "Dark web".
Thanks for alerting others who may not be used to such dishonesty.