Poor Communication and bad telephone etiquette

I am writting this review because I am not happy with how agents from your store operate. On Sunday I called you guys and a lady with a colored accent, I didn't get her name answered the call. I asked her to send my invoice to my email and she asked me to hold so she can enquire about something then proceeded to place me on hold for so long that the call ended up cutting. I called again she answered and told me to give her my details and she will note them down as the system is offline "because it is weekend" and she will send the email first thing Monday morning.Monday I waited for the email but I didn't receive it of which I called again to enquire as I need the invoice to apply for the additional 2 year warranty on your website but no one answered the call, I tried to call again someone picked up the phone and hung up the call.I kept on calling but the phone rang unanswered, my question why is there no one attending to the calls? I eventually told myself that I should stop wasting my time and airtime. I called today in the morning a male answered and I explained to him my reason for the call, he said he also wants to enquire so I should hold. Another question again what is it that is so big your agents have to enquire for them to just request for my email address and send me the invoice?? The guy placed me on hold for more than 5 minutes then transfered me to another line which rang unanswered also,why though, to even transfer me without even notifying me? This is so unprofessional and once again SEND THE INVOICE, I AM STILL WAITING,MY EMAIL ADDRESS IS ***.