So I want you to assist with this matter

Good day my aunt bought a stove last year at Railway furniture then she passed away the same year after bought the stove three months after buying the stove the I went to the shop with her documents to show that my aunty passed away so they want us to continue to pay .To my concern how can they sell the furniture without insurance.Did they told the buyer that Railway has no insurance cause they told me that they don't have insurance for old age people.Now they send us the letter that they want back the stove