Lewis Stores harassment

This is getting ridiculous. Lewis Stores is harassing my 75year old grandmother for a payment for MY stuff. I lost my job when covid19 hit and I still tried to pay as much as I can also paid today again.. 1st they sold a broken coffee combo to me which they refused to know anything about after the thing peeled off 3months later, I phoned them numerous times and asked to PLEASE remove my grandmothers details as I don't stay with her anymore but according to the *********** staff they "CAN'T" DO IT. Can someone from head office please get in touch with me I'm not even going to bother phoning the branch in my town because the service is pathetic. Don't get why they can't phone me (THE OWNER)