Whatsapp problem iphone

I have got a problem for the last 2 weeks, I can't use whatsapp bundle when I queried it , I was told there is a software problem with Iphones (I have a iphone 8 ) indicating that the problem is with apple, then was told to do certain updates, which has being done how many times already. I phone apple yesterday and they say it is the a problem with the iphone the problem is with cell c. I phoned cell c yesterday after a long story the lady tells me I must have positive balance not really so I said so tell me do I have a positive balance yes I do so now what. everyday I get a different answer and use your normal data why must I it is more expensive, not once have I received an sms, a call a email to say there is a problem but if I didn't pay my account you would be quick to phone me everyday. I have another contract with you and also with an iphone but no problem with that. when is this so called problem going to be sorted out, if not I am going to another provider to take over my contracts.