Lack of assistance regarding connections error

My mom recently bought me a Galaxy note 4 from Cell C. I had been using it for a month until I started experiencing connection problems. I can not receive calls from outside Cape Town. I went to Cell C in Cavendish, Claremont and they just messed around with the settings and said it is a problem with Android rejecting Cell C simcards. I came back again, and they said they could't help me because I do not own the account and said my mom (who is in Limpopo) should go to Cell C instead.<br> My mom went to Cell C and they tried calling me with different numbers. MTN to Cell C was working however the vodacom to Cell C numbers were't coming through. They then said that there was nothing they could do.<br> This is absolutely ridiculous especially considering that I am a student and I can not communicate with my mom or other family members who use vodacom. I was very disappointed by the lack of support/help I received from Cell C. <br>