Contract application

I app**** for a new device on the 7th of April 2019. Telkom phoned me on Monday the 8th of April 2019 telling me that my application got approved and they debited the first payment from my account. After the money got deducted I received an SMS saying that they don't have stock for the device I ordered. I follow up with them to find out when they will receive stock and they couldn't give me an answer . On Friday I followed up again regarding this matter and I didn't get a response. I tried phoning the sales department to follow up on my order but I didn't get any answer. This is really bad client services. How can I pay for a product I didn't even receive yet? Please inform clients if you don't have stock when they apply before you deduct money from their accounts. Telkom is really giving bad client services and it's pathetic to say the least.