Very poor after sale service and no feedback even though you phone numerous time: 4 months still waiting for my inverter and batteries

Very poor after sales service and support, I am waiting over 4 months for the return of my inverter and 2 200ah gel batteries. My system was installed in dec 2021, worked for 6 months, thereafter starting loosing charge. after over a month of trying to get hold of them, i finally managed to speak to someone and unfortunately, i had to pay for transport costs back to them. Since they received it there's only been contradicting stories, first it was batteries that is faulty, then 2 months later its the inverter, then i must pay for the charger unit on the inverter, they dont covered it under warranty, and so the story continues. Phone calls upon phone calls, they will call back, not one time they will return my call. There is no number to contact Managers or directors, they just dont give you any other numbers ! I am a pensioner and invested in this system, but they dont care. 4 months , we approaching christmas, still no indicateion when i am going to get my inverter and batteries back.