being bombarded with emails/letters from Allegiant-finance

I am wondering if anyone from the forum can give me a bit of advice please? 
My sister had clicked on a facebook link from a company called Allegiant-Finance - they could check if you could put in a complaint/claim to the Financal Ombudsman if you think you was mis-sold PPI etc from Morses Club incorporating Shopacheck. She answered a few questions and her details and pressed send. She hadn't heard back for a while, so actually forgot about it. She recently received email from this group Allegiant-finance stating that theyreferred her Morses Club incorporating Shopacheck Claim to the Ombudsman and have received an offer on her behalf of £7xx.xx and a breakdown of outstanding balance, HMRC tax and there fee of 36% £264.39. 
She replied to the email that she was not accepting any offer. Please stop going ahead with the claim. She is now being sent almost daily emails from this company stating she owes this fee and a letter through the door too. She has replied several times that she wants them to stop going ahead with claim But the emails keep coming. We have tried ringing CS but have been put on hold that long they hung up. Can anybody advise what to do next please? 
Thank you in advance 

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