Not willing to replace an Decoder where teh apps got hacked

My Decoder got hacked, i do not have access to my netflix nor my youtube on my decoder as someone has hacked it and activated the top packages on my account. Contacted the call centre last week and was advised to go to the walk in centre which i did. The agent there tried her utmost best to help try and resolve the issue,but the person stays logged in on my decoder. When i asked what is my next step i get told unfortunately my decoder is out of warranty and therefor a replacement will not be possible unless i buy one myself. This is deeply frustrating and poor customer service as i am entitled to stay with my price lock plan contract for 2 year of which i have 7 months still left on the contract, but DSTV cannot honour or help to replace a decoder which has been hacked and all formats of reset which the agent tried does not remove the hacker. This person is also as mentioned taking the top packages of which DSTV will bill me for everytime and then me as the customer has to go through the painfull process to phone in or go to the walk in centre to have it cancelled again.