Unhappy client

I bought a fridge at Russell's(April 2022) it's been giving problems since the day I bought I went to the store complained they acknowledged it's a factory fault but they didn't do nothing, called head office they told me they will call me within a week so that twice credit me since well l got new fridge they just gave me a reference number they never called me, who else can I complain to? So they can take me serious.