50mb Broadband still being charged �45 Plus 100mb extra �10 ?

My 50 meg broadband 12 month contract finished with Virgin about 2 months ago at the time when I took it out the price was �45 ( Without the phone line ) the thing is the same package is know �35 ( without the phone line ) So I rang up Virgin and was told that I would have to leave Virgin Broadband for 90 days and join again after 90 days to be able to get 50MB at �35 I mean is this right ? Also 100MB broadband is available in my area and if I upgrade to that I would have to pay �10 extra on top of the �45 and the total would be �55 a month even though 100MB Broadband is �45 a month without a phone line. So I don't no if I should leave Virgin for 90 days and then join them after 90 days and go for the 100MB at �45 ? Please can someone help me is there any other way around this ? I don't want to use Dial Up for 90 days :( Thanks