BAD AFTER SALES SERVICE

I bought and paid for an Inverter 300 watts "Switched" online on 23/03/2025. I received it on the 26/03/2025 only to find that the inverter was completely dead and could not switch On although I left it on Charge for at least an hour. I immediately repacked the inverter wit h the charger in its original packaging and sent a return collection for a new inverter. I received a confirmation email from their Customer service that the Supplier will call me within 24 hours, which never took place. I waited 5 days and the decided to advise them by email on the 3rd April. They emailed me back later the same day advising me that the Supplier instructed them to collect the item from me so that they could assess the product and swap it.- They collected the product the next day 04 April. I have had no contact from them or their Supplier to this day. When I sent them an email, they just never reply. I FOLLOWED IT UP WITH ANOTHER 5 EMAILS but my emails are being TOTALLYignored. They either have a "Don't care attitude or are DISHONEST.