MTN masked price plan change

I have a BozzaGigs Sim. An SMS with offers of discounted calls was received, which I subscribed to. Suddenly my data I had on my account disappeared. Upon enquiring about this, MTN said I changed my price plan through my subscription to the discounts on calls. I explained that I misunderstood and wanted to cancel my subscription to the discounts （which they said was impossible）since it was in the cooldown period. Two operators said no, but the connection became so bad, I couldn't follow anymore. During my second attempt the first operator said I could only change back to my original price plan within the first 30 days of purchase. When I informed her I'd require to be put through to someone with the power to reverse it all, I was put through to an excellent, capable and polite person. She opened a ticket upon which I was asked exactly what I'd like and that they'd respond within 24 to 72 hours. Fingers crossed! Checking the initial SMS it was clear that no price plan was mentioned, nothing indicated that subscription would result in a price plan change, nor that there would be any consequence to existing （paid for and yet unused）data, calls or texts.