dissatisfied customer

I upgraded my package from just 5G to 5G with two additional 4G SIM cards, The sim cards were not working. I called the Rain contact centre multiple times now and I'm still not satisfied. The consultant will cut the call on you in the hope that i will transferred to the next available person. After two months of paying for a service, I'm not using, I called the consultant again and they send me activation procedure to follow but only one sim-card worked, and the other sim cannot even be read by the phone I am using. I have been calling customer service without success. I have no option left but to cancel my contract with them, they are false adverting.