Bad services

Please I need assistance with this Company On Air. I have received a call from them in 2019 claiming that they are working with MULTYCHOICE and i am qualifies for 2 decors and I will be paying R139 per month for both. They told me that they can see that am paying my accounts with Multychoice via debit order which is correctly so, they delivered the decors to me last year around April till today those decors are not installed . I have being calling them asking when are they going to send installer to me, my last conversation with them was that they will send someone to come and take decors back which was in December. In January I received a call from 1 of agent telling me that my account is in arrears I told her that am not going to pay for those decors as they are not installed and I am still waiting for someone from their offices to come and take them back as am no longer interested. Am still getting message from them telling me I own them money last SMS I received from them Our intention is to avoid further action on your OnAir Account , pay R834 to avoid further arrears and a negative credit profile. Call ***. Banking Details: ABSA Acc Number *** Branch 632005. Ref: OA-***0-1 FINAL NOTICE!! Pay R3058 for your OnAir account by the 07/02/2020 to avoid possible legal handover and additional costs . Call ***. Banking Details: ABSA Acc Number *** Branch 632005. Ref:OA-***0-2 please can this people stop this am sick and tired of them