Useless online service

Placed an order on 6th May. After weeks of waiting for your pathetic service, I finally received a tracking number on 26th May stating that the order is out on delivery. It is now June and I have not received anything as yet! Where the hell is my order?? I called the call centre on 2 occasions with promises that they will call me back. That was a lie, I'm still waiting for a call back. I sent a DM on Twitter, that was blatantly ignored. I understand that you have a backlog but so did other retailers so you should stop using that pathetic excuse as they made a plan and delivered, your lies and excuses sre not acceptable anymore. Really tired of you. This is going to fall upon deaf ears but just deliver my order asap. Order number is listed as the reference number.