Wrong address on bill

I live in a townhouse - the address on my bill includes both sides of the townhouse (North/South).  I've tried to change this for years, but every time I try with Comcast, I get nowhere.  I'm told to try different departments, or "don't worry about it.".   However, I am paying over $200/month for my services, and people in my neighborhood are paying $80 for the same services.   My attached neighbors are very sketchy - they used to brag that they were stealing wifi from another neighbor.   I'm really wondering if somehow I am paying for THEIR cable and internet since BOTH addresses are on my bill AND I am paying DOUBLE what other people are paying on my same block.  Can someone please help?