Bad Service as Sell Direct

Sell Direct Marketing on behalf of Telkom, their service is very very bad. I am waiting now for two week for my upgraded device to be delivered and there was a R150 they needed to debit from my account for a power bank, no one is saying anything until i called and they saying the money failed to go through. I gave them permission to debit my account anytime and confirmed there is funds in my account, i have never got any failed debit notification from my bank nor them calling back to say the debit failed and maybe we double check the account details, that is in 2 weeks later only when i followup they saying money failed to come of my account. Really this is annoying.