Dr Roof Stikland - Terrible customer service

Used Dr Roof to waterproof our tile roof in May 2017 at a cost of more than R10000. We recently had a few heavy downpours and I noticed some water marks running down from the ceiling on one bedroom wall. Dr Roof offered a 48 month guarantee on their work so I called their office on numerous occasions to try and get someone out to come and assess any particular issue that would be causing a leak. It is nearly impossible to get through on any listed number and I left messages on two cellphone numbers. Eventually a person by the name of François (0824167946) called back and promised to send a crew out to my home. Weeks have passed and I have not seen or heard from the guy since. I've made several attempts to get in touch but to no avail. His cellphone inbox is full and you can't leave a voice message. I've sent messages to his number. Still nothing. Useless beyond reproach!!!!