Bad service from the Fix clothing shop TFG group

I placed an order last month I ordered a dress it was supposed to come with a belt attached to it upon receiving my dress there was no belt I emailed them no one bothered to respond been trying countless times I even took to social media to address my concerns still have no been assisted, I paid full amount and I’m sitting with an incomplete dress I’m disgusted by the Fix of how they treat customers no willingness to sort out queries at all I must grow to extreme lengths I’m unhappy