Since Cox doesn't own the wiring to and in the apartments, there will be a service charge to repair/replace cables, unless you have Cox Complete Care. Cox's responsibility is up to the D-Mark, (Demarcation point), where the service is turned over to the apartments.
It's like the power company, they are required to support the wiring UP TO the back of the home, or the distribution point at an apartment, after that, it's not their responsibility. The power company isn't going to come and fix your electrical outlets in the apartment, or in your home. It's not their responsibility, just like that cable wire in your apartment isn't Cox's responsibility. So, while the wiring inside the apartments may be bad, it's not Cox's blame. You want to place blame? Place it on yourself. Get the letter from your rental/leasing office granting them the ability to make the necessary repairs/wire replacements, and call Cox back up, let them know you have the letter granting you permission to have Cox make the necessary repairs/run the wires needed, and then MAKE SURE you have Cox Complete Care, @ $10.00 a month, or be prepared to get billed for the repairs.