Faulty Gas Heater

Ordered a folding gas heater for winter on 2nd July. Delivery delayed & faulty item delivered. Winter is over & and it has still not been Ordered folding gas heater 2 July,. Delivery delayed & item faulty. Winter now over & still not collected, after how many promises. They mention that the item was quality control checked & will be checked again when returned. The fault is in the gas feed, which couldn't have been checked, as it came in kit form, gas feed connector in sealed package!