Nashua Mobile
Account Closed but still receiving billing

I have closed my account with this company for a while now. I have ported my numbers to Vodacom, but i am still receiving bills from this company and i don't know why.

On the same date, 11/21/2013 i have received the following bills on my old account:

. R649.80
. R328.67
. R-46.26

I don't trust this company.