Tired of Cell C's excuses ... almost denying me cancelation

I notified Cell C that I was traveling to Sweden for 3 months and asked them to set up my international roaming but because I was awaiting funds in my account and was in arrears with Cell C, they told me it could not be done. I then requested a cancelation of a renewal that was coming up in March and was told that I need to put it in writing. So I did this ... and now they phone my son and tell him that I need to ring them!!!!!! How must I do this if you denied me international roaming!!!! And why can you not accept my email for a cancelation?!? I am sick to death of their incompetence! I have requested cancelation and if you have a problem with this, you can ring me on the Swedish number provided in my emails to them. And if it is not canceled as per my request, I will contact the necessary Ombudsman upon my return to SA end April.