Still no feedback from MTN on disabled second sim slot on dual sim phones

Dual sim second sim slot disabled. Still no feedback from either MTN Potchefstroom or Head Office. On Wednesday Potch branch promised me they will see if they can negotiate a cheaper data bundle rate seeing that I can't use my second sim for data (which is a Vodacom sim because Vodacom's data is cheaper than MTN. Sorry MTN). But up to date I haven't heard anything. I phoned MTN HQ twice today. On the second call I asked them to please not put me through to Sales because they can't help me, so the lady said she'll transfer me to Complaints. After a long silence she came back to me and said they did receive my complaint on HelloPeter, they are working on it and will phone me back. How long must I wait? I only have seven days to change my contract. Change, not cancell, unfortunately.