Synchrony Bank Credit Card Complaint

Synchrony Bank Credit card department,

Billing statement

i am having problems whit my walmart credit card i always paid on time by the time they send me the statement of my bill i already have paid them.i am retired i get pay the begging of the mount and i pay them because they sent my statement always late.now the sent me the statement 3 weeks later - inform me that i have a pastdue over my account which is not truth now they dont email me they call at my house all day long .they are harrasment until -