Bad service

I cancel my policy with Iwyse (26 April 2019)long before they deduct the premuim from my bank account, and on the 28 of May 2019 they deduct the premium from my acount. i phoned and send a lot of emails and spoke to A guy there with the name of Ricardo and he promised me that they will give me my money back after i send all the necessary documents to them, i send them a back online statement that showed the transaction and after that when i phoned him back he said no they don't accept that statement, I had to go to the bank and get a stamped statement, we went to the bank and got that, i did send that through to them and waited for more than a week after the money wasn't back in my account, i phoned him again and the he told me that they also don't accept that i had to go to the ATM machine and get a statement there, i told him that is not accepted and he must make sure that the manager phoned me after he told me that the manager is in a meeting, till today i am still waiting for some one to phone me or my money back