Lies by rewardsco/mondo sales person

In november 2023 got a call from Rewardsco/Mondo saying they are from MTN, they offered a upgrade sim only, they assured me I can add a device later, and if I do it after 90 days it will be cheaper, the truth is actually I can’t add a device alone but have to add a complete package with data and minutes, this is complete false advertising, they did a investigation but say she said after 90 days I can upgrade for a fee, but ignored that she said I can add a device, they also don’t want me to listen to the recording. MTN send me to them now they say MTN store have to get the recording for me. This blatand lies to make a sale. Stay away.