Paying for the Benefits that i didn't receive. Blue Label Connect

I took a phone contract with Blue label connect, and the phone only worked for few weeks after i received it, i reported and they didn't come to collect the phone, i stopped paying because the phone was not working. After stopped paying during the second months they cancelled the sim card, meaning i no longer receive the benefits that came with the contract, i only received the benefits during the first three weeks that the phone was working. Now they want me to pay the full contract amount of which the phone only worked for three weeks and i only received the contract benefits for that three weeks. i don't have the problem paying the account, but they must also give me the benefits that came with the contract and come and collect the phone that only worked for three weeks. The contract is now finished but i have to pay for somethings that i didn't even use. Please assist me with Blue label, i tried to explain to their consultants but they only telling me to pay the full contract amount.