Pathetic customer service

Ok so I got my tumble dryer back and I tested it, they machine goes on but it doesn't heat up, it is louder and doesn't dry the clothing. I sent the technician that delivered the machine and he asked if he can collect it again I said yes please, he didn't respond until today I sent him a Pic of an error the unit is giving he then told me to log another repair. This tumble dryer was bought brand new and the issues started almost immediately 😳 there is now constantly a fault and this unit is constantly needing repairs. Hisense refuses assist me with a refund or a replacement at this point they are not answering any questions is pose at them they only give me excuses. Please can someone assist me