Vodacom not allowing contract approval, but Cell C does

I wanted to take out a contract with Vodacom through the IStore at the Glen today. My phone is faulty and can not be repaired so I have to get a new phone. I have been a prepaid customer so wanted to take a 24-month contract. According to Vodacom I cannot get approval for an R550 contract???? For no reason, the acquisition at Vodacom just stated I can not afford it. If you check my payslip and what I earn a month, I am sure you will see that I can afford it - I earn a decent salary monthly! So Vodacom, you lost a customer today. I walked into Cell C next door and within 30 minutes a new contract was signed at R650 per month with no hassle what so ever. How on earth is that possible. I have been a Vodacom customer for 18 years .......what a joke!! You will never have me as a customer again!