I'm very disappointed and frustrated

I'm very disappointed with vodacom service, I've been with what I've gone for more than 5 years but I'm thinking of cancelling my contract because I can't even get any help from customer care to subscribe collection, and this month they even debited my account twice on the 12 and on the 15th and all these days are not even my debit order date so I don't know who authorise them to Debit on the 12 and the 15th. so every time I call customer care they say their system is not working they will call me back so they never get back to me yesterday I also called subscribe's collection. I'm really frustrated and disappointed. I've been very loyal to vodacom for so many years but now I feel like they're taking advantage of my loyalty if they can help me I must look at the other options and cancel this contract of them.