no reception in my house: can I get out of my phone contract early?

[blutura]

9 months ago I signed up for a new mobile phone contract with M8 Telecom, a company that uses the Optus network, but is otherwise separate from Optus. I signed a 24 month contract and got a new handset for $30 a month, on a $49 cap plan, where I get $200 of credit. So basically, I pay $79 a month for $200 credit. I was content for the first 7 months, but 2 months ago I moved to a new unit in a different suburb and there is little to no reception in unit. The only way I can make a call without it dropping out is if I go an stand in the corner of my yard, or go and stand in the street. I have tried it with a Motorola, Samsung and Sony Ericsson phone, and all have problems maintaining reception.

On the Optus website there is a coverage finder where you enter your street address and it shows a very detailed, street level, map showing what coverage is in your area and, sure enough, it shows my entire suburb as being completely covered, so I don't know why I can't get reception. Its not just me either, others living in the complex have to go and stand in the street to make calls too.

Friends of mine are with Vodafone and had no problems making and receiving calls when they visited, so I'm thinking of switching to them.

I know some of you are probably thinking, just use your home phone, but the thing is, I'm paying $79 a month for a phone that I can't use when I'm at home, and because I'm on a cap, I'd rather use the mobile, then rack up a big bill on the home phone. The other problem is, that if someone sends me a text message, then I often don't get it until I leave the house, which is often too late.

Now, sorry for the lengthly background info, but I'll get to the point.

Do you think I can use the lack of reception in my unit as a reason to get out of my contract early, without having to pay out the remainder of the plan?