I wish she send you an e-mail... That said you cannot ignore the summons. I would do as Dave suggested go into court allow your lawyer to explain the situation with the reference number if you don’t have any documentation and hope it is enough... If not you can ask for some more time and perhaps you lawyer can ask for a court-order to release all information and why not call the manager you spoke to as a witness?
Other than that;
It is really good advice.
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