Upgrade gone wrong.

I am very disappointed in the service from MTN. I upgraded in store on 08 June 2020. My debit order for 1 July and now for 1 Aug is incorrect. When I phone the 135 number nobody can assist me because my account is on the new system and only a few have access to this system and they are busy someone will call me back...... I am still waiting for 4 days. Then I went onto Facebook and onto MTN Facebook and asked for assistance. The response I got on Facebook Messenger was to confirm my person details before she can assist. i said I feel uncomfortable doing it on the platform as it is not secure, can she rather call me? and her answer was no. Really is this how MTN treat their customers. I feel like sending back the debit order until my account is sorted.