Refund for the faulty base set

I bought a Sealy base set from sleepmasters South gate in October 2021, on February 2022 the Bed was making squicky and cranky noises. I sent an email to the customer care center requesting for a full refund or an exchange with another brand, but they only exchanged the mattress and did not exchange the base, I sent an email again informing them that the bed is making more noise than before and request for a full refund but still they are not considering my request, I am stuck with a faulty bed set and sleepmasters is refusing to give me my money back or exchange the bed set for another brand. Please help as I have been communicating with them from February but there is no satisfactory solution. I feel that they take me seriously and they don't care about their customers