Poor performance

Aug 2018 we were informed that we will be part of a forced migration to LTE. 11 Aug 2020 a sms notice arrives at night stating the order will be delivered. On 12 Aug we contact the call centre on 10213 and they cannot find any order, The assum[tion is that it will be the modem. Alas, it was a cellphone. Yesterday 12 Aug and today 13 Aug none of the call centre numbers respond. So ready to cancel this service of more than 30 years