Day 23 Service Status Out of Service

Can anyone tell me why I constantly have Service Status: Out of Service? 

I am a new Smarty Customer. 

In 23 days I have only been able to use my phone twice. This is on the same day as contacting Smarty. Everything works perfectly fine but the next day Service Status is back to Out of Service. 

Data is working very well so far. No problem there. 

It's like the phone sees the Network but is not authorised to use it. 

I cannot access my online banking as the code that is sent to SMS is not sent. 

I cannot call anyone nor can they call me. 

I have already missed 3 appointments because of this. 

I need to make a hospital appointment and can not do it. 

I am paying for an unlimited plan but only getting data access. 

I have been on live chat for hours trying to get a positive outcome. 

Although helpful and polite. Each Agent goes through the same series of things to do but it makes no difference. 

I can make WhatsApp calls but certain companies will only accept calling me on my mobile number which they cannot do. 

Please if anyone knows how to contact Smarty Technical Team or how to solve this I would be so greatful. 

My next payment is in 5 days time and after nearly a month. I am NOT getting the service I am paying for. 

Smarty will be able to see how many phone calls and text I have made. 

This is so stressful.