I am using Singnet ADSL 512K...was using 256K before but complain like heck to their Sales Dept for fark up service etc..etc..until they upgrade me foc...and still gave me the goodies..
Bottom line, no use verbally screwing them - whack them in black & white good good..

By the way, I bought my own ADSL modem/router (Linksys) and my single 512K line is currently supporting 3 Pcs. A bit slow at times but manageable. Come July, will bang table again to upgrade to 1500/3500 foc since I am already paying 512K for $45 which is actually 1500K line..
Customer is always King - remember this!
