PAID FOR GOODS 4 MONTHS AGO NO DELIVERY

I ordered goods and paid for it via credit card in May already. When u phone DHL with the tracking number they tell u that it is passed the 45 working days delivery period, but no information can be given on where the package is. I must now phone to the USA and get Garcinia Forte to launch an investigation. When has it become my problem to track the package. I have send emails to the support centre but get no reply. I WANT MY MONEY BACK AND THEY CAN KEEP THE PRODUCT