Worst customer service experience

Hello Peter. I bought something from Cotton on then last week Monday I received an sms, tracking status but my status changed to incomplete address though I submitted the correct address. Ever since there I have been trying to call dawnwing to check that's wrong but they don't answer, been writing emails almost every day and didn't get any response and I also requested a call back on their website but nothing at all. I need my parcel urgently. I need help. Thank you.