Absolute shambles, I ordered 1 office chair for my...

Absolute shambles, I ordered 1 office chair for myself on 30th of last month and still the chair has not arrived. Was sent an email a few days after to say my chair wasn't in stock and they offered me an alternative which was great (il come back to that in a moment) on this email I was told I would have my chair between 3-5 working days and still nothing. Trying to get hold of their customer service team is a joke! When you call you are given option 1 to go through to their sales team or option 2 to their customer service team who would normally deal with orders already placed but good luck trying to contact them as the telephone system they have in place is that bad that it hangs up on you after 30 minutes of holding which is incredibly frustrating as a customer that just wants to know the status of their order. I tried to speak to their sales team to get a voice on the end of the phone however I was met with some very rude and unhelpful people that were argumentative when I spoke with them. My most recent call with one of their sales team I found out that the alternative chair that I had been offered is not not available to me but this was not communicated to me on email which is poor if you ask me. From someone that works in a customer facing role in my day to day there are some fundamental problems with the set up and the systems that this company has in place that seriously need reviewing as I would not expect to give this low level of service to anyone that I work with in my role. I hope that someone senior in the business reads this and reaches out to me as I am less than happy about this and want a resolution. I understand that with the current environment things are taking a little longer but this is a joke, theres no way for you to see a status of your order so your time is spent calling up their broken phone line that doesn't work - sort it out! I have also taken to twitter in hope that this has a wider reach.