DomainCheap let my domain expire

I paid DomainCheap in the 5th of September to renew my domain. Got a receipt and everything. Yesterday I got an email from CO.ZA that my domain expired.<br> <br> Now I'm unable to get DomainCheap to reply to my ticket. Their live chat keeps saying that he will forward the ticket to concern admin and then nothing happens.<br> <br> I wanted this sorted yesterday already. This domain will become deleted and I feel helpless and can't do anything about it.<br> <br> The telephone number that CO.ZA provides for DomainCheap doesn't work and their live chat person doesn't want to give me a phone number. My requests to speak to a supervisor or someone that can help me is ignored.<br> <br> I'm at my wits end. I took leave for yesterday but have been unable to enjoy it because I am so stressed about this domain. It makes my blood boil that not only did they allow this to happen but that there's seemingly no way for me to fix it.<br> <br> Please, if anyone can help. I just don't know what to do anymore.