Clientele cancelled my mother's hospital insurance plan without her concern, clientele is taking advantage of elderly people

My mother Ethel Sematle has been with clientele paying the hospital insurance plan since from 2012, if my memory serves well in March or April I got an sms from them saying that my mom's hospital insurance plan has lapsed because she missed two payments. She called them in Mid May because she was still pay them even after she missed those payments, they said they no longer have that type of service and if she want to continue with the service there's another one but she will be treated as a new customer and she cannot continue with that one. That was unfair and unreasonable as it is a day light ******* how can they cancel my mom's insurance without writing a letter a letter or giving her a notice. My mom was willing to pay her arrears and continue with her premiums but they decided she was treated unfairly by cancelling her insurance with any notice or sending her a letter instead she was given an unfair choice that is not benefiting her instead it is benefiting the business I they don't even care if that choice was satisfactory to her. If that is the case because my mom has been paying them and she has been loyal to them, clientele must pay her back all her premiums from 2012 because she paid for the service she didn't even use and they decided to cancel he hospital insurance plan without following proper channels. Clientele is took advantage of her because she is an elderly person, her ID number is ********** 195080.