Game Online Purchasing - Worst Service Ever

I have purchased an office chair online from Game Stores on the 25th of September and requested delivery. I was informed that the delivery will take 3 to 5 days for delivery. I followed up on Friday the 28th of September and the order displayed 'In progress' still. I contacted the online service centre and was told that the problem will be escalated and someone will be calling me back. No one did. I called twice again on Monday the 1st of October - day 4 - and was told the same both times. No one called me back. I emailed the service centre as well - no feedback. I called again on Tuesday 2 October - day 5 - and still the same - no answer as to where my order is and no feedback / call returned. Email received from the service centre to say the problem has been escalated and someone will call me back. No one can tell me where the order is and the online website shows ' In progress' only. This is not the first time I purchase online, but it is definitely the worst service ever received by such a large company. Never before had I had such issues. Usually you are able to follow the progress of the parcel on the website and they send you emails / sms's to inform you when to expect delivery. I have received the worst service ever and still don't know where my parcel is or when it will be delivered.