Insurance Claim Not approve after 2 month of complains.

I logged a insurance claim call on the 26.03.2020 for the broken phone that I have received in 2016. 1) They said the phone was not registered with MTN.They asked me to proof to them that I receive the phone from MTN and did so. (a) I received this phone from them after the call logged in 02 January 2016 and they, this matter was finalized on the 26 August 2016, however when I logged insurance claim call for the very same cellphone they give me in August 2016, they claim not knowing anything about the phone. (b) Only last week Wednesday 20 March 2020 Mongezi said the matter and confusion was sorted out. 2) I receive few messages from them saying that the claim was approved. 3) Today they said their insurance company have rejected my claim due to not using their skorokoro for more than a month. 4) The above happened in 2016 as well.Should I go to Parliament or ICASA/Nigeria before MTN can start treat one as the customer and stop their hide and seek stories.