Poor service from MTN

The MTN Customer Care service has been extremely disappointing. When our Wi-Fi contract expired, an MTN upgrade agent contacted me. However, the upgrade offer didn't seem active, and shortly after the upgrade, our data was unexpectedly depleted, which rarely happened before. Despite spending over 40 minutes on the phone, the consultant admitted the previous upgrade wasn't activated and proposed another upgrade, assuring it wouldn't significantly raise our monthly costs. To my surprise, the upcoming bill will be almost double what I usually pay due to pro-rata charges from multiple offers beyond our initial contract, along with a one-time service fee. The call agents have been misleading, unprofessional, and one even laughed at me during a call. This behavior seems aimed at pushing upgrades without clearly disclosing the associated charges, which is unfair to loyal customers. Apart from paying for pro-rata amounts which we couldn't use as it said that we ran out of data.