Mint Mobile complaint: Poor service

I purchased a phone 12mnths unlimited plan. The phone arrived but no sim card. I called customer service immediately was advised that a new sim card would be dispatched to me I would get a ation call or email the next day. I received no ation so I called them again with all the reference numbers to verify my purchase the case number. I was told a replacement was not possible a refund was issued I could buy a new plan if I wanted. As yet I have recieved no ation of a refund being issued nor have I received a refund. I have called mint mobile customer service at least 6 times trying to find out the status of the refund or a replacement. Each time I am dealing with representatives who’s 1st language is not english they are struggling to communicate with me effectively.
I paid up front and have not received the product I paid for. While i understand things can go wrong I do not understand a customer service department that has absolutely no customer service serves only to frustrate the customer even more!

Furthermore I asked for the corporate headquarters phone number although a California number it connected to the same main customer service number! This has been one of the worst customer experiences I’ve ever had absolutely appalling!