My combi fridge freezer isn't cold enough ?

My Beko combi fridge freezer is only 2 years old but today it appears to have stopped working properly. The freezer contents are defrosting and the fridge isn't cold enough either even on max setting. The light is on and the fan is working in the frezer. There is a noise a bit like bubbling water I can hear from inside.
Is it worth calling out a repairman???