Poor customer service

On the 23/07/25 I took a data contract with mtn. The sales agent that assisted me with the contract. Failed to mention or even ask if I had any current data that has not yet been used up. Apon the activation of the contract I have lost 25gb worth of data in total. Phoned customer regarding the matter they can't help me. Send a email to the complains only to receive one email and a phone call they will look into the matter which was all on the 25/7/25 Up until now still no feed back or anything. Seems like they just expecte paying customers regardless of contract or pre-paid user just to accept that they pay for a service and have to lose what they pay for