Cell C recently discovered a glitch with its WhatsApp billing, which affected around 150 subscribers
New 2SIM prepaid starter packs, and a reduced call rate on Virgin Mobile.
SMS messages would cost a fraction of a cent if mobile operators priced text messaging like mobile data.
Cell C has announced the launch date for its LTE network in the Western Cape.
Apart from facing a $5.2bn fine in Nigeria, mobile network MTN has this year already paid millions of rands in other penalties, according to regulators.
Vodacom wants to partner with video on demand services, while launching its own offering in 2016.
The Competition Tribunal of South Africa has agreed to indefinitely postpone a hearing regarding a R7bn merger between Vodacom and Neotel.
Vodacom advised on Monday that its proposed acquisition of Neotel has been put on hold.
The Competition Tribunal hearing is expected to be among the last hurdles facing the Vodacom-Neotel merger.