No ISP service and no commitment to resolve

My internet usage is used 80 % email and 20% browsing. I am unable to send emails as it is daily blocked or so slow that it fails. Can't even browse 90% of the time. I have made over 27 phone calls to OpenWeb (most of them to their technical department). I have even left messages for someone in management to contact me as I threatened to cancel my contract if this was not resolved. No one from management has done so. The response I get from Openweb is the problem is with Internet Solutions or they are still resolving it. Its now over 6 weeks and you are taking my money but not even providing reasonable service. If I was downloading all the time I could understand the issue but this is my email and general browsing that does not work. Please fix it or cancel my contract and refund my money.