omg...poor thing! :/ yeah with customer service and receptionists, generally employers go for ppl who are more experienced doing phone calls or with admin certs. Fuck this really sucks for you...i saw a lot of adds for customer service role on seek that doesnt require experience...you can try those! i was looking at those as well...good luck!
hope you don't feel deflated...you will get better with practice. there's a certain phone mannerism that is something that comes with practice. don't take it to heart!