Might want to check your long distance charges...
Example: if using AT&T as carrier,AND you also see other long distance charges,(ie),Ameritech; then you are being over-charged.
Especially if on a plan such as,pay per minute. The phone co. is ultimately responsible for any "refunds" for said over-charges you may have incurred.
This happened to me, had been going on least a year; phone co. refunded back only six(6) months,
but guess I should be happy with that (lol)...