Terrible service

I ordered and paid for goods on the 25th of August and received an email advising that my goods will be delivered within 2 - 3 days. After calling the call centre number on a numerous times from the 31st and my call being dropped, I eventually sent an email and received a reference number on the 06.09.2017. I then called again on the 7th and managed to get through and was advised after holding for more than 5 minutes that there was an issue with my order. The agent advised that they did not have my size and I had an option of a refund or waiting for more stock. She did not know when they would be receiving stock and admitted that they would not have called me had I not followed up. This is absolutely unacceptable!