Disgusting service from Telkom

I currently have a Flexion 2 cellular contract with Telkom.I added a recurring voice bundle of 200 minutes at R80.00 per month.Late last month I contacted the contact centre to change it to a 100 minutes bundle at R40.00 per month.Agents said they will mail the request to their supervisors to action it.Since then,nothing at all changed.No response.I tried doing same at their walk in branches.Even worse!No joy at all.It is absolutely frustrating to receive this poor service and experience such complacency from Telkom.