Extremely bad service

I bought airtime via the RCS app on Friday 5th Oct and it was not credited to my cell phone number. Have contacted the contact centre 7 times. Yesterday I spoke to a lady at 12:16 who advised she was escalating to her supervisor and will contact me in 10minutes . No call by 16:00. I made contact with the contact centre again and was told it would be escalted still no call till now. I spoke to Yongezwa this time at on 7th Oct at around 16:53. She advised she was sending a mail to the person I spoke to on Friday evening 5th Oct at around 19:47. And still no feedback. The airtime recharge was deducted from my account and still no airtime. Please advise. Nobody in your contact centre actually does their work. The service is shocking!