Cell phone HORROR!

We were ****** at gunpoint on 01 September 2017. My phone (Samsung, S4) was one of the items ******. Upon calling MTN I was told I need to get the IMEI number of my ****** cellphone at the store that I bought it from. I went to the Truworths store in Randfontein on 02 September to ask for the info. I was told that I needed to go to the actual store where the phone was bought. I then went to the Eloff street Truworths to enquire. They couldn't pick up anything and proceeded to call the head office for info. The head office stated that because the account had been handed over to the attorneys, they could not assist. On Monday, 04 September, I called the attorneys, Anthony R and Associates and spoke to Unathi Mbilini. According to Unathi, the records of the actual purchases are not kept with them. She proceeded to give me the Truworths Legal Department number. I was assisted by a very nice lady that could give me some info regarding the date of purchase(08 Nov 2013) and the Doc number( ********** ) number. I was told to go back to the store where the phone was bought and ask for a manager to get contact the CDC to enquire what the IMEI number is. I tried calling the Eloff Street branch but to no avail! Now I really cannot go to the same place for the same thing just to be told again they also cannot assist. In the mean time, I cannot blacklist my phone because MTN also cannot assist. Who can assist with this seemingly simple request?!!!!!!