Cellphone

I bought my phone on the 3th of March. After a month there was a functionality issue with it so I returned it for repairs. After three weeks, it is now having issues with connecting with my SIM cards. I asked for a refund they deemed it impossible, nor is exchanging. The service customer's name is Queen she works under the department of Edgars mobile. She is so rude and doesn't know how to communicate with a customer.