Paying for two licences at the same house

I have bought my mom a tv three years ago because hers was broken, I have been paying for my licence and my mom is also paying hers, we live in the same house watch the same tv but being made to pay separate accounts, Recently I'm being threatened and harassed with phone calls and sms's. I have paid my licence and sent proof of payment two times already to [Email Removed] but VVm keeps bombarding me with these calls. i keep getting ref numbers when i send an email with proof that i payed at woolworth but just Monday i received another sms saying that i shou