Unwanted Delivery (without Consent)

I have ordered my package and agreed to a certain amount, so they phoned me one day again and promised this free gifts, on arrival I found that they have charged me for the items, on the invoice they send with the parcel. My installment went from R405 to R970 a month for 12 months. Left it there, about three days ago, they re-send the whole order again, without phoning me or asking me if i am interested in the package again, as I received another invoice for x12 months again, now starting to frustrate me, as it is not affordable to pay that large amount every month, I LOVE the products, don't get me wrong. but, the installment is too high, I did send them a mail asking for my latest statement and to please explain how do they just send a parcel without consent (as it is a lot of money) and even asking if I wanted the same products again. No one has gotten back to me as yet. Parcel is with me, I would have loved to just top-up with some of the products, but not the whole (same) order again. Hopefully someone will see this and get back to me.