outrageous bill

can a person with KNOWLEDGE please explain why my BASIC cable service with 30 mps internet can go from $160 and JUMP to $360 in one month with no notice ... no premium channels, no special sports channels ... just pure plain lowest tier basic cable .... when I call, Customer Service tells me I have to contact billing .... when I call, Billing tells me I have to contact Customer Service ... and to top it all off, in the past week I have gotten several emails and texts to "REMEMBER TO RETURN UNUSED EQUIPMENT" ....

I do believe my account has gotten MIXED up with someone else's ... but no one seems interested in trying to fix my problem and they keep trying to pass the buck to someone else

SO AGAIN, can I PLEASE have a person with knowledge explain my bill to me