Unhelpful, lies, no response

I am so upset and tired right now. I can't believe the shocking service I have received from Bonitas. More than three months after submitting a claim, I finally received a statement saying the amount would be paid on 12 July. Note that the statement confused me as there were a lot of minuses on it and then the same amounts loaded again, in four separate line items. On 12 July, I received a payment for one of those line items. The other R700 owed to me wasn't in my account. I then emailed them and received a reply with the subject line "Closure of Query", which said that they had paid the full amount. I then phoned them and was told again that their system says the full amount had been paid. While on the phone with them, I double checked my bank account to confirm that the full amount hadn't been paid. All they could tell me was that on their side it says it has been. I then went to my bank, they checked, and they gave me stamped printouts of my account. I then tweeted Bonitas to ask if someone from management could contact me. They asked me to DM my details, which I did, and then two days later they rep**** to say that they "can confirm that correspondence was sent to you confirming that the claim was paid to your FNB bank account on the 12/07/2018". I then rep**** saying that I'm not querying whether or not I received correspondence – because yes, I did receive that – I'm querying the fact that your system is saying one thing and my bank account is reflecting a different thing and I demand that someone senior contact me. I never received a response. I then tweeted them again and still nothing. I am so frustrated and shocked by this. How can you just ignore your customers? I wish I'd checked them out on Hello Peter before as I see this lack of communication and lies appears to be their MO. I can tell you sincerely that this is one customer you've lost and that I will be sharing this shocking experience with others who want to join a medical aid.