Miway insurance wants it their own way

I completed an online quotation and received a premium of R984 however when I spoke to the agent she quoted me R1340. I explained to them the premium I received and the agent mentioned that the website provides incorrect quotations. She could not deal with the situation and neither could her supervisor. my premium changed 3 times and promises where made which were not fulfilled in getting back to me. the agent kept calling me asking me the same questions indirectly telling me I have changed details of where my car would be parked off during the day. I told the agent that I have changed no such information and her supervisor thereafter told me that he can give me the premium at R894 with an excess of R12 000. I refused as the system gave me this premium with a R3400 excess. they refused to assist and told me that I did not receive such premium online. I am convinced that the supervisor changed the information and insisted I went back on my profile to check only to discover that indeed they changed the premium on their side to appear as R1340. This is ********* and unacceptable because they are cheating customers and wasting our time by getting cheap premiums and thereafter change.