extremely bad service

On the 8th I sent a complaint to MTN regarding the cancellation of my deceased fathers account. Anna from Vaal mall phoned me stating she did phone me and that she did email H/O on the 30th, however she would email them again, stating she emailed Crista. Since then no one has contacted me regarding this account and the request to port the numbers to pre paid or to close the account or even discuss the matter with me. MTN has been very unhelpful with this regard as they keep invoicing his account even after I went in store on the 24th September.